Duel

Crime investigator Deuk-cheon gets good news about his sick daughter, but she's then kidnapped.

Deuk-cheon captures the kidnapper's doppleganger and becomes even more confused.

Deuk-cheon and Sung-joon work together and learn a shocking truth from a homeless person.

Sung-joon is framed for murder, and Jo-hye uses her investigative powers to stop the next murder.

Sung-joon and Deuk-cheon meet a serial killer. Meanwhile, Mi-rae finds her mother's research.

Sung-hoon disappears with a mysterious list. Jo-hye finds something in common among the victims.

The secrets of the clone experiments are revealed. Deuk-cheon finally finds Sung-hoon's hideout.

Sung-hoon gives Deuk-cheon a mission to save his daughter, and Mi-rae learns Sung-hoon's intentions.

Sung-joon regains his memories and helps Deuk-cheon again. Jo-hye and her team begin the next stage.

Sung-joon disguises himself as Sung-hoon. Deuk-cheon's daughter tells him why she was kidnapped.

Deuk-cheon spends time with Soo-yeon. Jo-hye is mortified when she learns the truth about her chief.

Deuk-cheon starts researching Dr. Yong-seob, and the search for the stolen cure begins.

Deuk-cheon apologizes to Dr. Yoo-ra. Meanwhile, Mi-rae learns a shocking truth about her mother.

Mi-rae gets in a car accident, and Deuk-cheon tries to uncover the truth behind it.

Mi-rae agrees to help Soo-yeon. Sung-joon goes to meet up with Sung-hoon to keep his promise.