Lee Dae-chul, sentenced to death for murder, faces new twists when a man confesses to killing his missing daughter. The baffling case leaves the police puzzled.

The police secretly search for Lee Eun-hye, Lee Dae-chul's daughter. The media leaks the news, raising doubts about Dae-chul's innocence and the legitimacy of his death sentence.

Park Gun-ho meets the stranger who ordered him to kill Dae-chul, but is killed. Do-chang and Ji-hyuk search for his phone with incriminating photos.

Pressure for Dae-chul's execution grows. Jo Sung-dae fails to kidnap Jin Suh-kyung. Do-chang and Ji-hyuk follow a lead to Ji-hyuk's cousin, Oh Jong-tae.

Suh-kyung interviews Nam Gook-hyun, opposing re-investigation. She and Ji-Hyuk analyze CCTV footage for Jong-tae's alibi, discovering it's doctored.

Dae-chul's retrial petition is accepted after media exposure. Do-chang plans to implicate himself, causing concern for his superiors.

Yoo Jung-ryul sees Jong-tae as a threat. Dae-chul's retrial begins, with Ji-hyuk's wristwatch key to proving his innocence, causing concern among police officers.

Captain Nam silences a witness. Dae-chul’s retrial fails, and he is hanged.

Do-chang and Ji-hyuk investigate Chief Moon while facing punishment. Jong-tae frames Ji-hyuk for sexual exploitation, leading to his arrest.

Ji-hyuk is cleared, and Chief Moon apologizes to Eun-hye. Yoon pressures Do-chang to stop investigating. The police reopen Gun-ho's suicide case, with Sung-dae as the main suspect.

Nam resigns, and the police begin a manhunt for Sung-dae. Jong-tae attempts to have him killed at the docks, but Sung-dae is arrested by Do-chang and implicates Jong-tae.

Jong-tae attacks Ji-hyuk with a knife, and both are injured. The squad investigates Detective Jin-su's murder, while Suh-kyung grows suspicious of her boss, Yoo's involvement.

Jo Sung-gi’s remains are found. Sang-mi forces Chief Moon’s resignation. Suh-kyung uncovers key links, Jong-tae is arrested, and Jung-suk’s role becomes more mysterious.

The Justice Minister's ex-secretary is arrested. The Civil Petition Division head takes the blame for hiding evidence. The squad searches Jung-suk, who admits to a murder.

Jung-suk confesses to killing Sung-gi and Detective Jin-su, declaring Dae-chul's innocence. He tries to frame Jong-dae, while Detective Nam holds crucial dash-cam footage.

Jung-suk jumps to his death, blaming Jong-tae. Jong-tae is sentenced to life. Ji-hyuk uncovers dash-cam footage revealing Nam's guilt and shoots him to protect Do-chang.