Luna Kim runs the city's most weirdest job at the moment and that is... catching a bunch of cheaters. The Cheater Catcher. It is a risky job for a girl alone where she has to gather evidences of cheating as proof for her clients. Nevertheless, it is an easy money for her and she's helping some poor soul at the same time. No one can stop her to success. Everything is supposed to be good and glorious like that.

Until she gets an offer from a soon-to-be groom and hires her specialty.......

This is a Love Story forming within Cheater Catcher, starring the catcher herself, Luna Kim, and the suspected cheater, Chanyeol Park.