Inside: a folder labeled Guide des épisodes . Inside it: a detailed timeline of a woman named “S.”—her habits, her schedule, her fears. Every Tuesday and Thursday, 7 to 9 PM, S. attended a ceramic workshop. Léo had noted: “She always leaves her car unlocked. She never looks behind her.”
The romance intensifies. Ji-wook falls for Bong-hee but struggles to express it. Meanwhile, Ji Eun-hyuk begins to show interest in Bong-hee, and Ji-wook’s ex-girlfriend, Cha Yoo-jung, tries to win him back. The four find themselves in awkward, often humorous living arrangements as Yoo-jung moves into their building.
That night, Clara opened the Guide des épisodes again. At the end, a final entry: “Clara – Thursdays, yoga class. She always leaves her phone in the car. She never checks her backseat.”
Clara confronted him that night. His reaction was not guilt—it was relief.
While the team handles minor cases, the real threat looms. A mysterious figure, Hyun Soo, is introduced. It is revealed that he was the actual killer of Bong-hee’s ex-boyfriend. Bong-hee spots him on the subway, triggering her memory of the murder night. Ji-wook begins to suspect that a serial killer is on the loose.
One night, unable to sleep, she opened his laptop. No password. That was the first red flag she ignored.
Eun Bong-hee, a trainee at the Judicial Research and Training Institute, is navigating a messy breakup when she accidentally mistakes Prosecutor Noh Ji-wook for her ex-boyfriend and assaults him. Later, Ji-wook is assigned to train her. The tension rises when Bong-hee becomes the prime suspect in the murder of her ex-boyfriend.
Just when life seems perfect, Hyun Soo orchestrates one last attack from inside prison (or through an accomplice). He targets the law firm. The team must use their wits to survive this final trap without breaking the law they swore to uphold.