A Hard Day (2014)

Driving back from his mother’s funeral, homicide detective Ko Gun-su (Lee Sun-kyun) runs over a man in a dark rural street. In a moment of desperation, he hides the body in his mother's coffin. A few days later, Gun-su flips through a listing of open cases and finds his accident victim. His colleague is on the accident case and is slowly making progress. Making matters worse, a witness steps forward – a detective named Park Chang-min (Cho Jin-woong). For a reason unclear to Gun-su, Park wants the body. Without no other choice, Gun-su digs up his mother’s grave and retrieves victim's body from his mother's coffin, only to find gunshot wounds on it. As Park’s threats become more vicious, and hit closer to home, Gun-su decides to face Park head-on once and for all.