Kim Hae Il is a hot-tempered Catholic priest with a burning sense of justice. He heads to Busan to pursue a drug case which originated in Gudam-district, Seoul. Helping him in his pursuit are Prosecutor Park Kyung Sun, Detective Gu Dae Young from Gudam Police Station, and Detective Gu Ja Young from Busan.

A drama about a Catholic priest with anger management issues and a detective from the Gudam Police Station who meet during their joint investigation into the murder of an elderly priest.