Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.

A college boy Su-min is looking around paintings in a gallery when he hears someone screaming for help. That’s where he first meets a high school girl, Hyun-jin. They soon meet again in a park, and she realizes he is gifted; he can read people’s mind.