Bong-Hee (Nam Ji-Hyun) is a judicial apprentice at the Judicial Research and Training Institute. One day, on the subway, she mistakes Ji-Wook (Ji Chang-Wook) for a molester. Ji-Wook is a prosecutor and denies being a molester, but Bong-Hee doesn’t believe him. Later, she catches her boyfriend Hee-Joon (Chansung) in a hotel lobby with another woman. Her boyfriend is also a judicial apprentice at the same institute. Bong-Hee is hurt by her boyfriend’s apparent infidelity and tells him that she will sleep with the next man she bumps into.
Bong-Hee indeeds propositions the next man she bumps into. When she looks at the man, Bong-Hee realizes the man is the same man she saw on the subway … Ji-Wook. They decide to have drinks and Bong-Hee later passes out. When she wakes up, Bong-Hee finds herself at Ji-Wook’s place.
3 months later, Bong-Hee is assigned to work in Ji-Wook’s office. She works hard there. During this time, she runs into Hee-Joon and tells him to take his things from her apartment. Later that night, Bong-Hee goes to a nearby convenience store and when she returns to her apartment, she finds Hee-Joon stabbed to death. Bong-Hee is arrested for his murder and Ji-Wook becomes the prosecutor in her murder case. Even through heavy pressure from Hee-Joon’s father (who is the chief of the district prosecutor’s office), Ji-Wook finds evidences to proves Bong-Hee’s innocence and sets her free. Due to this incident, Ji-Wook quits his job as a prosecutor and becomes a lawyer. Bong-Hee attempts to find the person who murdered her ex-boyfriend.
2 years later, Bong-Hee and Ji-Wook meet again, but on opposing sides. Bong-Hee is representing the plaintiff and Ji-Wook is representing the defendant in a court case.