A Change of Heart

FONG CHI-LIK, a formidable businessman, is renowned for being ruthless and quick-tempered, taking any means necessary to achieve his goals. In order to successfully acquire an old urban district and redevelop it into a sleepless city, CHI-LIK frightens Acquisitor WOON with threats over and over again. CHI-LIK's wife TONG SIN-HANG is very meticulous, taking care of things for her husband behind the scene. As a nurse, SIN-HANG not only looks after CHI-LIK's health, but also deals with the political infighting of CHI-LIK's company. After having her car rear-ended by a truck, SIN-HANG demands indemnities from the truck driver, who then suffers a heart attack while driving away for fear of having no money to pay. Fortunately, an off-duty police officer YUEN SHIU-GAT riding a bicycle passes by, helping the driver out of trouble. SHIU-GAT's boyfriend YIU YAT-SHAN, a cardiologist at Mercy Hospital, is optimistic and kind-hearted in nature. As the birthday of his mentor, a famous cardiologist KOK MING-HON, is around the corner, YAT-SHAN and his good friend as well as his contemporary cardiologist, TONG SIN-CHI are planning a celebration for him. When CHI-LIK appears to be really harsh in the meeting, his assistant TING CHUN-PING informs SIN-HANG, who calls CHI-LIK right away so as to avoid him from stressing his heart. It turns out that CHI-LIK once passed out on the street, and luckily got rescued by Dr KOK, who then confirmed that CHI-LIK suffers from Acquired Coronary Heart Disease. After Dr KOK passed away due to an accident, YAT-SHAN tells CHI-LIK that he will be his attending doctor. Though YAT-SHAN advises CHI-LIK not to participate in the upcoming Charity Cycling Competition, CHI-LIK does not believe YAT-SHAN's diagnosis and insists on taking part in the match.

With CHI-LIK being admitted in hospital, some changes have taken place in his company. KY, who claims to be a co-founder of the company, seizes the opportunity to convene a board meeting, coercing CHI-LIK to let him take over the management. A cakery owner reports to the police that he has suffered repetitive property damages by someone anonymous and suspects it was the deed of a land developer regarding property acquisition, so SHIU-GAT brings along YAT-SHAN there for the on-site investigation. YAT-SHAN takes SHIU-GAT to a nursing home to visit his grand aunt LUK YUNG, but SHIU-GAT leaves early after suddenly receiving a tip-off regarding a tattooed brothel client. Later on, SHIU-GAT reveals the issues of her mother to YAT-SHAN, trying to make him understand the reason why she has not agreed to marry him. Taking advantage of the police investigation, CHI-LIK puts pressure on Acquisitor WOON. SHIU-GAT leads her team to CHI-LIK's company, but is totally unable to find any evidence to testify against CHI-LIK. CHI-LIK experiences symptoms of angina, shortly afterwards, he feels nothing at all, so he thinks he has recovered. With YAT-SHAN secretly asking a psychiatrist to meet up with SHIU-GAT, the two instead become estranged from each other.

CHI-LIK requests all staff to undergo a health checkup, but finds out that only few are in good health. So SIN-HANG is determined to get a suitable donor organ by any means necessary. CHUN-PING's girlfriend YAT-FEI is a postgraduate student. After learning that her parents will come to Hong Kong, CHUN-PING changes his car regardless of the enormous cost. SIN-HANG also helps receive them because she regards CHUN-PING as her own family member. SHIU-GAT joins forces with another team led by CHIU SIR to catch a lecher obsessed with long legs, during which she comes to realize that his team members have long been lazy and sluggish. She also re-encounters her primary school good friend, HA SZE-KA, in the mission. LUK YUNG borrows money from a finance company for YAT-SHAN's twin brother YUET-SHAN, but she ends up fleeing for fear of being asked to pay off the debt. As a result of carelessness, CHIU SIR falls and dies. After YAT-SHAN's persuasion, his family agrees to donate his organ, but to no avail. Following the death of CHIU SIR, SHIU-GAT is transferred to take over his position as a team leader. Then she goes to find LUK YUNG, probing into the matter of YAT-SHAN and his twin brother.

CHI-LIK treats his subordinates really well, purchasing a luxury mansion for newly-married CHUN-PING and YAT-FEI. Understanding his time is limited, CHI-LIK hopes SIN-HANG will continue the development of the sleepless city, and he even makes his will as he feels that he has already reached his time. With her credit card being due, plus her landlord demanding the rental payment, SZE-KA comes up with an idea to obtain SIN-CHI's new mobile phone by deception. CHI-LIK does not even have the strength to utter a word, so he blames YAT-SHAN for failing to heal him of his sickness. Apart from secretly ordering an engagement ring, YAT-SHAN also invites SHIU-GAT to the beach, where he tells her some bygones so as to encourage her to walk out of the shadows. On top of that, YAT-SHAN also seizes the chance to propose to her. Having seen YIM-FUN in the hospital, SIN-HANG plants an idea of being her son's burden into her mind, making YIM-FUN want to commit suicide. Though YAT-SHAN successfully prevents YIM-FUN from committing suicide, out of the blue, a bunch of bricks fall from above hitting both of them when YAT-SHAN was attempting to save YIM-FUN.

Notwithstanding a surgery, YAT-SHAN is pronounced brain dead, so CHI-LIK gets informed that the heart transplant operation can proceed. SHIU-GAT thinks there's something suspicious behind YAT-SHAN's death, so she goes to the scene to investigate it. The transplant operation completes successfully, however, due to the privacy of the donor's identity, CHI-LIK is unable to express his gratitude for that. SIN-HANG gives a precious necklace to YAT-FEI, who instead worries about CHUN-PING. WING-YAN brings SHIU-GAT home to celebrate her father's birthday, and her father is actually SHIU-GAT's subordinate, namely SAI-KAU. During her visit, SHIU-GAT gets to know that all her co-workers express strong dissatisfaction over her. CHI-LIK did not have a sweet tooth before his surgery, but now he often craves sweets on impulse. Ever since YAT-SHAN's death, SIN-CHI has been visiting SHIU-GAT to avoid leaving her alone. SHIU-GAT leads her squad to a night club to check their licence, to her surprise, she discovers that SZE-KA is actually a Nightclub PR Hostess. By chance, SHIU-GAT catches a glimpse of someone in a taxi, and that man looks almost exactly like the late YAT-SHAN......

The man whom SHIU-GAT met looks alike YAT-SHAN very much, and he turns out to be YAT-SHAN's twin brother YUET-SHAN. YUET-SHAN merely resembles his elder brother in looks, in fact, he is a trifler, living by his wits. When visiting LUK YUNG, SHIU-GAT thinks that YUET-SHAN has already informed her about YAT-SHAN's death, unexpectedly, YUET-SHAN shows up in the nursing home wearing clothes similar to his late brother YAT-SHAN. CHUN-PING and YAT-FEI are enthusiastically preparing for their wedding ceremony, during which the two argue a bit as YAT-FEI wants to devote herself in social work. Although CHI-LIK hopes to show his appreciation to the donor, SIN-CHI tells him that the hospital is refrained from revealing any information of the donor. CHI-LIK and SIN-CHI are going to witness the marriage of CHUN-PING and YAT-FEI in their good suits, however, they arrive at the funeral of the late YAT-SHAN. As such they have no alternative but to enter the place. YUET-SHAN loses money in gambling as luck is against him. When he is pestered by his debtor who demands a pay-off, he comes across CHI-LIK.

YUET-SHAN refers to SIN-CHI for information of the relationship between YAT-SHAN and CHI-LIK, but SIN-CHI sees through him, knowing that he just tries to play up to CHI-LIK. YUET-SHAN then changes his subject, claiming that he can help SIN-CHI get his phone back. He carefully disguises himself into a wealthy younger generation, which has an effect on SZE-KA's vanity, so he finally manages to take back the phone for SIN-CHI. Upon their return from their honeymoon, CHUN-PING and YAT-FEI report to CHI-LIK that KY starts plotting something in secret again ever since he failed to seize power in the last shareholder's meeting. In order to mend fences with KY, CHI-LIK invites him to play tennis together, yet the two start yelling at each other at the tennis court, and the peace talks between them are also blown away. With YUET-SHAN and SIN-CHI seeing SHIU-GAT and SZE-KA walk out of the restaurant, SIN-CHI follows SZE-KA out of sympathy. After seeing her being driven away by her landlady and being homeless, he proactively helps her by taking her to stay in SHIU-GAT's home temporarily. YUET-SHAN receives an appreciation greeting card from an organ transplant beneficiary, which is passed on to him by the hospital, and learns that his elder brother's heart has been transplanted to CHI-LIK.

Having been arranged to work as a bartender, YUET-SHAN goes to double check with CHI-LIK to see whether there is any misunderstanding, but CHI-LIK tells him to start from a lower-level position. SHIU-GAT and SZE-KA start to live together, and the two often have conflicts between each other owing to their different life-styles. When SZE-KA reports for duty, she sees that YUET-SHAN has been working as a waiter in the same place. In his business report, CHUN-PING states that the progress of the sleepless city is hindered due to KY's action on the sly. Furthermore, someone is reportedly promoting natural volcano beauty mud, which arises SIN-HANG's interest, so she orders CHUN-PING to probe into it. Following CHUN-PING's investigation, CHI-LIK plans to pass it up, nevertheless, SIN-HANG proposes passing on the beauty treatment plan to KY. When everyone goes to SHIU-GAT's home in celebration of her moving to new flat, SHIU-GAT asks YUET-SHAN why he works in CHI-LIK's company. YUEN-SUM gets injured by a glass bottle that falls from the sky. At that moment, SAI-KAU makes up his mind to investigate it. Shortly afterwards, by relying on the glass bottle, he forms an idea and then tracks down the suspect. WING-YAN invites SHIU-GAT to do some volunteer work at beach, and it turns out that CHI-LIK is also taking part in it.

While dining with SIN-HANG, YAT-FEI reveals her boring life as a newly-married wife. SIN-HANG tries to intercede for YAT-FEI so that she can go out and work, on the contrary, her move triggers the conflict between the couple. SZE-KA recalls that SHIU-GAT really wanted to have a birthday party with the performances of a magician and clown during her childhood, so she forces YUET-SHAN to undertake the task now. SHIU-GAT plays the game of Mastermind with YUET-SHAN, who reminds her about the late YAT-SHAN. KY finally comes to realize that he has fallen into a trap, so he goes to have a word with CHI-LIK. CHI-LIK not only coerces KY to sell his shares, but also plans to transfer the shares sold by KY to SIN-HANG. YUET-SHAN sees SIN-HANG and YAT-FEI when he seeks aid from the community centre, trying to apply for allowances in relief for the nursing home fees. All of a sudden, someone attempts to take away SIN-HANG by force. Having seen this, YUET-SHAN goes to her rescue and saves her, however, YAT-FEI is instead abducted. The kidnappers flee to the front door of CHI-LIK's company and plan to leave YAT-FEI there, but are noticed by CHI-LIK.

YAT-FEI is safe, and CHUN-PING is no longer against the idea of letting YAT-FEI work. When CHUN-PING and YUET-SHAN assesses a new wine, YUET-SHAN discovers there is something wrong with the new wine and suggests reporting it to CHI-LIK as soon as possible. However, CHUN-PING thinks they should conduct a thorough investigation, resulting in that SZE-KA gets sick after secretly drinking the wine out of greed. WING-YAN was very confident that she would get a job as a social work officer, yet YAT-FEI defeats her to win the job. When WING-YAN was going to pour out her grievance to SHIU-GAT, she sees that everyone cares only about YAT-FEI, so she takes off in a huff. SIN-CHI chases after WING-YAN and tries to comfort her, who suddenly kisses him. Although YUET-SHAN has been promoted, he is requested by SZE-KA to buy some take-out food with BEN. Having seen this, CHI-LIK calls YUET-SHAN to his car so as to let others know YUET-SHAN's amicable personal friendship with the boss. SHIU-GAT receives a phone call from the nursing home, saying that YUET-SHAN has not paid the fee for two months. YUET-SHAN feels really dissatisfied that SHIU-GAT always compares him with the late YAT-SHAN, so he speaks out that he is not a double for YAT-SHAN, causing SHIU-GAT to leave with a saddened demeanor.

SIN-CHI really takes notice of the early traffic accident involving some dogs, suspecting that someone is using the dogs to smuggle drugs. Ever since YAT-FEI became their superior, WING-YAN and other staff members' workload has surged tremendously. While WING-YAN complains that YAT-FEI gives them unreasonable instructions without prior knowledge on the tasks, YAT-FEI also senses that her colleagues have prejudices against her due to her being a celebrity. CHUN-PING and YUET-SHAN have been acquainted with each other, and YUET-SHAN is requested by CHUN-PING to spy on in the club. SHIU-GAT gets injured while leading her squad in an operation, but SZE-KA cares only about playing Mahjong with someone else and leaves her alone at home to rest. Having seen YUET-SHAN in a daze, SHIU-GAT misconceives him to be the late YAT-SHAN, trying to get close to him. SIN-CHI tells CHI-LIK that his father has developed a malignant tumor in his neck, and he intends to persuade SIN-HANG to meet her father once. CHI-LIK agrees to help convince SIN-HANG. Though CHI-LIK tries to persuade his wife, SIN-HANG insists she will no longer see her father. SIN-HANG also feels that CHI-LIK's personality has changed a lot.

With regard to a valuable watch being reportedly lost by a night club guest, YUET-SHAN questions SZE-KA whether she has anything to do with it, but SZE-KA denies it. YUET-SHAN and SIN-CHI bump into a colleague from the club, PETER, whom they think is suspicious. In the meantime, YUET-SHAN gets a phone call, claiming that SZE-KA has been abducted by the owner of the watch, a mobster HUNG. Knowing that CHI-LIK is upset about not getting a haircut due to Master SHEUNG's retirement, SIN-HANG goes to have a word with Master SHEUNG in private, threatening him to resume his profession as a barber. CHI-LIK, in an attempt to help YAT-FEI to deal with the problems of young night drifters, finally launches a project to help the youth, named "Operation Down". YAT-FEI is in charge of fundraising, whereas WING-YAN is responsible for the recruitment of new volunteers. CHI-LIK goes to attend the activity of "Operation Down", yet merely reaches a rest stop halfway through the route. AU YIN-KUEN, a young night drifter, feels the activity is very boring, so he tells his friends to leave. Meanwhile, CHI-LIK shares his own experiences there, persuading them to strive for the betterment.

In the middle of his meeting at the office, CHI-LIK receives a phone call from SIN-CHI, who tells him that his father MING-SUM has been admitted in hospital after having potential symptoms of lymphoma cancer. CHI-LIK then adjourns the meeting in a hurry and urges SIN-HANG to visit her father. YUET-SHAN is still very popular in the club. In order to be able to stay alone with YUET-SHAN, SZE-KA pretends to have something to say, trying to gain his sympathy. Moreover, she airs her grievances to him by taking SHIU-GAT's loss of mother as her own experience. As the young night drifter YIN-KUEN is accused of stealing and then fired, YAT-FEI decides to conduct a home visit on her own. Until then, she has finally realised how hard it is to provide outreaching services. Having learned about this, CHI-LIK agrees to let YIN-KUEN work with YUET-SHAN as a junior bartender. YUET-SHAN and SIN-CHI cannot stand that SZE-KA took advantage of her best friend's past, so they decide to teach her a lesson. Running into CHI-LIK at night, SHIU-GAT feels that CHI-LIK resembles the late YAT-SHAN very much, so she raises that she would like to hear CHI-LIK's heartbeat, which is unfortunately video recorded by someone......

In order to uphold a successful company image, SIN-HANG intends to make a teen movie with the models from her company. YUET-SHAN, SZE-KA and SIN-CHI think that SHIU-GAT holds a rather rigid and boring routine, so they try to help her form a new image. As a result, not only does SHIU-GAT look different, but also SZE-KA appears in a new style. With SIN-CHI solving problems for SZE-KA again, others think he has a crush on her, yet he immediately denies it. CHI-LIK invites SIN-CHI and SIN-HANG to dine out together. At first, SIN-HANG was not planning to go. Having accomplished her task ahead of schedule, she rushes to the restaurant, but to her surprise, she sees CHI-LIK is dining with SHIU-GAT. LOK-MAN, one of SHIU-GAT's team members, is called as the "Goddess of the Police" by the netizens. She then resigns and joins SIN-HANG's modeling company. After a model, VANNESSA.S, becomes a victim of an indecent assault, she braves out for her, causing VANNESSA.S to be dismissed. VANNESSA.S attempts to commit suicide during a bit of depression and CHI-LIK goes to her rescue after getting the information.

While all the shareholders are praising SIN-HANG for her proper management on the crisis of the model's suicide attempt, the profit of the finance company is instead sinking, so CHI-LIK claims to take full responsibility. SIN-CHI meets up with SAI-KAU, hoping that he, as a police, would help investigate the unsolved death of SHIU-GAT's mother. Surprisingly, SAI-KAU discovers that the murder victim was actually his old flame of a young age, so he suspects whether SHIU-GAT and him are biologically related. YUET-SHAN approaches CHUN-PING, proposing a Bartending Competition, but gets no support from the latter. Getting inspired by SHIU-GAT, YUET-SHAN comes up with a feasible plan. The two then hurry in making an overnight proposal, which is misconceived by SIN-CHI that the two are seeing each other. CHI-LIK asks someone to make an investment in his project of the Sleepless City in a bid to solve the financial problems, but he grows discontent with his counterparts after knowing their deliberate delay. In view of this, YUET-SHAN seizes the chance to propose a scheme. Though CHI-LIK feels there is a significant potential, SIN-HANG and CHUN-PING are both against the idea.

The small loan project implemented by YUET-SHAN attracts CHI-LIK's attention, thus YUET-SHAN gets promoted to project officer. SZE-KA decides to curry favor with YUET-SHAN's grand aunt LUK YUNG, hoping to become his secretary. SAI-KAU inquires things about SHIU-GAT's father, and is determined to amend his mistakes. CHUN-PING gets an injection of capital from a Malaysian investor LAM KENG-SHUI to the movie produced by the modeling company. On the other hand, in order to have enough funding for the sleepless city investment, SIN-HANG secretly invests in stocks by using company assets, and requests CHUN-PING to conceal it from CHI-LIK for her. Discovering that SIN-CHI has developed some feelings for SHIU-GAT, SAI-KAU encourages him to take the initiative in pursuing SHIU-GAT. SIN-CHI's father has made great improvement in recovering from his illness. However, when thinking that SIN-HANG still gives him the cold shoulder, he heaves a sigh. As soon as he sees the stocks are sinking, CHUN-PING hurries to report to SIN-HANG, who instructs him to keep the company management from knowing that. As chance would have it, their conversation is overheard by SZE-KA who is goofing off nearby.

YUET-SHAN learns from SZE-KA that SIN-HANG and CHUN-PING have lost company money in bad investments, so he hints it vaguely to CHI-LIK. Right after SIN-HANG returns, CHI-LIK asks about the reason behind her alleged involvement in the embezzlement, triggering an argument between the pair. On the other hand, YAT-FEI goes to seek SIN-HANG's advice because CHUN-PING is often too busy to talk to her. CHUN-PING knows that it's YUET-SHAN who has blabbed to CHI-LIK, therefore SIN-HANG alerts CHUN-PING to keep an eye on YUET-SHAN to avoid letting the latter supersede him in the company. SHIU-GAT pays tribute to the late YAT-SHAN on his birthday, ahead of which YUET-SHAN has already arrived there to pay his respects to his late brother. Coincidently, SIN-CHI also comes to pay his tribute when he sees YUET-SHAN and SHIU-GAT being together, which is a fatal blow on him. He even gives WING-YAN the diamond necklace that he specifically bought for SHIU-GAT. Apart from making a good suggestion to CHI-LIK to help him fix his relationship with his wife, YUET-SHAN himself also invites SHIU-GAT to go hiking on a remote island. Before his departure, he receives a phone call from SZE-KA......

SHIU-GAT is waiting interminably at the pier alone when she runs into CHI-LIK who just arrives. Due to the heavy fog at night in the countryside, CHI-LIK accidentally twists his ankle, and is accompanied by SHIU-GAT to the boat to receive first-aid treatment, during which the two chat with each other about their love lives. Having returned home, CHI-LIK breaks the deadlock in his relationship with SIN-HANG, and SIN-HANG also knows that he has been with SHIU-GAT the whole night. Upon her return, SHIU-GAT sees that YUET-SHAN and SZE-KA end up in the same bed, so she gets really mad and drives away YUET-SHAN. In a restaurant, waiter YUK all of a sudden grabs a knife to attack SZE-KA. While hunting YUK, SAI-KAU suffers severe stab wounds to his abdomen and is sent to hospital, ahead of which he reveals to SHIU-GAT and SIN-CHI that he is actually SHIU-GAT's biological father. Reflecting on the past when the crime took place, SHIU-GAT merely remembers that the man at the crime scene had a dragon tattoo on his arm. SHIU-GAT and CHI-LIK track down YUK who is still at large, but CHI-LIK gets his arm cut by something sharp, resulting in the dragon tattoo being inadvertently exposed through his sleeves.

With CHI-LIK once again suffering injuries for saving SHIU-GAT, SIN-HANG cannot refrain from getting jealous at SHIU-GAT. On the flip side, CHI-LIK who is determined to make a match between SHIU-GAT and YUET-SHAN says he will do all in his power to help YUET-SHAN. In order to get close to CHI-LIK, SHIU-GAT purposely goes to the restaurant that CHI-LIK often visits, and takes away the wine glass for lab testing. Despite being stopped by SHIU-GAT, SIN-CHI still pays a visit to CHI-LIK's home by taking advantage of visiting his own sister so as to investigate CHI-LIK's past. Occasionally, YUET-SHAN spots that KEN from his company socializes with some problematic clients and smells something fishy, so he joins forces with SZE-KA to investigate KEN. The photo of SHIU-GAT hearing CHI-LIK's heartbeat from an earlier time makes the cover of a magazine, greatly affecting her career. CHI-LIK promises SIN-HANG that he will never ever see SHIU-GAT again, hoping it will help alleviate her prejudice against SHIU-GAT. Once again, YUET-SHAN shows his affection towards SHIU-GAT, saying that he just wants to make SHIU-GAT smile again though he cannot replace YAT-SHAN.

Eventually, YUET-SHAN manages to move SHIU-GAT. Though SHIU-GAT has accepted YUET-SHAN, she appears reluctant to start a relationship with him. SHIU-GAT knows that she must probe into KY who endured hardship with CHI-LIK from the very beginning if she wants to investigate CHI-LIK's past. When KENG-SHUI urges SIN-HANG to make up her mind on their joint venture to build some film studios as soon as possible, SIN-HANG comes to realize that KENG-SHUI's real intention is to launder money under the disguise of the entertainment industry. SIN-HANG attempts to appoint CHUN-PING as the business decision-maker in order to get a green light for her film studios investment, so she tries to wheedle each shareholder into voting for promoting CHUN-PING. Though CHI-LIK agrees with her, he suggests promoting YUET-SHAN to his special assistant, reporting directly to him. When YUET-SHAN and SHIU-GAT are dating, CHI-LIK seeks YUET-SHAN in discussion of business. SHIU-GAT then accompanies them to CHI-LIK's home with ease in an attempt to search for more clues in CHI-LIK's room. Knowing that his wife deliberately hides the bank account statements from him, CHI-LIK fears that she might court disaster anytime she takes risks, so he has a ferocious quarrel with her.

With her efforts to become a chairwoman falling through, SIN-HANG unexpectedly asks CHI-LIK for a divorce. CHI-LIK decides to terminate the business of the modeling company, leading to a fall-out in investments of the movie and filming studios that SIN-HANG and LAM KENG-SHUI were cooperating. As a result, SIN-HANG faces a claw back threat from LAM KENG-SHUI for his loss in total of $200 million. CHI-LIK goes to negotiate with KENG-SHUI, however, he only carries $50 million in cash with him. YUET-SHAN hopes to mend his relationship with SHIU-GAT, who currently cares nothing but to solve the case and lacks the strength to start a relationship again. In order to show his determination, YUET-SHAN buries the watch given by SHIU-GAT in the landmark of the isolated island, where they were viewing the fireflies. Nursing his grievance against SIN-HANG, LAM KENG-SHUI disfigures her face. Having suffered such a huge blow, SIN-HANG becomes even more eccentric and tends to go to extremes. While YUET-SHAN delivers soup to her, SIN-HANG seizes the opportunity to stay alone with him, trying to implant him the idea that CHI-LIK is suspected of killing the late YAT-SHAN. Later on, YUET-SHAN cleans up all the personal belongings of CHUN-PING, during which he discovers a confession letter written by CHUN-PING, pointing at CHI-LIK to be the murderer who killed YAT-SHAN......