Hyeon-soo, a CEO of a private detective agency, visits a pension with a client asking for her dog. While waiting outside of pension, he is falsely accused of kidnapping the client. During the arrest Hyeon-soo, a serious car accident occurs and people misunderstand Hyeon-soo as a prosecutor instead of a suspect. To find the real criminal, Hyeon-soo pretends to be a prosecutor. Hwa-jin, an elite prosecutor but demoted to the provinces while trying to catch a law firm conglomerate Do-hoon, meets Hyeon-soo. Hwa-jin finds out this case is related to Do-hoon, and she begins cooperating with Hyeon-soo. While cooperating, they realize that there is a hidden truth behind the crime.—Canon y mus