Seon-woo is a cold-blooded perfectionist who runs an expensive restaurant. He is so skilled at his job that he has earned the unconditional trust of Boss Kang. Mr. Kang has a problem — it seems that his young girlfriend, Hee-su, is seeing someone on the side. Kang can only trust Seon-woo with this matter and orders him to kill the girl if the suspicions turn out to be true. After a few days of surveillance, Son‑u catches her with her lover, but he disobeys orders and lets both of them go.