Kim Hae-Il (Kim Nam-Gil) is a Catholic priest. He makes spiteful remarks and he can be rude to others. Koo Dae-Young (Kim Sung-Kyun) is a detective. He talks a lot and he is also timid. Park Kyung-Sun (Lee Ha-Nee) is a prosecutor. She is smart and beautiful. She is also ambitious as a prosector and good at her job.
Catholic Priest Kim Hae-Il, Detective Koo Dae-Young and Prosecutor Park Kyung-Sun work together to solve a murder case involving a senior Catholic priest.