The series is about Noh Ji-wook (Ji Chang-wook), a prosecutor, and Eun Bong-hee (Nam Ji-hyun), a prosecutor trainee, and how they work together on a mysterious case involving a sly psychopath murderer. They find out how deeply connected they are by their past. A forgetful killer can be a dangerous thing. Noh Ji Wook is a prosecutor who changes jobs to become a private attorney due to circumstances. Eun Bong Hee is a prosecutor trainee under Ji Wook while he was a prosecutor. Attorney Ji Eun Hyuk (Choi Tae Joon) is a longtime family friend of Ji Wook’s who betrayed Wook by cheating with Wook's ex girlfriend.
When a murderer strikes, Bong Hee suddenly finds herself as a suspect.[9]
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