Season 1

When a young boy accuses his father of trying to kill him, Cha Ji-won investigates. An unwelcome reminder of Do Hyeon-su's past walks into his shop.

The police wonder whether they have a copycat killer on their hands when a dead woman is discovered with an unusual injury. Kim Moo-jin remains tied up.

A man is found murdered inside a restaurant. Hyeon-su is caught off-guard when Ji-won and her team show up at Moo-jin's apartment.

Ji-won tracks down Hyeon-su's sister. Hyeon-su and Moo-jin scheme to keep an incriminating photo out of the police's grasp.

Hyeon-su is kidnapped. As the police scramble to catch the taxi driver, Ji-won is horrified to realize that her husband is the victim.

Ji-won begins to question everything she knows about her husband. Meanwhile, Baek Man-u urges Hyeon-su to protect their secrets.

After Moo-jin's claims about Do Min-seok's accomplice go viral, Do Hae-su appears in front of him. Ji-won gets a glimpse into Hyeon-su's past.

Reunited with his sister, Hyeon-su asks whether she remembers the man from their father's funeral. Ji-won eavesdrops on their conversation.

A man's voice on an audio recording triggers Hyeon-su's memories. Ji-won tells Hyeon-su her feelings for him have changed.

Determined to save the trafficked victims and to learn the identity of his father's accomplice, Hyeon-su puts himself at risk with a call to the police.

Choi Jae-seop wants Ji-won to sit out on the case, but she refuses to listen. Hyeon-su's plan to bring down Yeom Sang-cheol goes sideways.

To spare her from worry, Hyeon-su keeps another secret from Ji-won. Hae-su decides it's time to come clean about the villager's murder.

Man-u and Gong Mi-ja are ready for Ji-won and Hyeon-su when they arrive for a confrontation. The next day, another dead body is found.

While framed for a murder he didn't commit, Hyeon-su sets out to save the life of his father's victim. Ji-won puts her daughter in Hae-su's care.

The police leak a false story to the press hoping to lure out the true culprit. Hyeon-su and his father's accomplice finally meet.

Nothing makes sense to Hyeon-su when he wakes up, least of all Ji-won. To help Hae-su win her trial, Ji-won and Hyeon-su visit a key witness together.