Kim Hae Il is a Catholic priest. He makes spiteful remarks, and he can be rude to others. Koo Dae Young is a detective. He talks a lot, and he is also timid. Park Kyung Sun is a prosecutor. She is smart and beautiful. She is also ambitious as a prosecutor and good at her job. The three of them team up and work together to solve a murder case involving a senior Catholic priest. (Source: AsianWiki)