(갑동이)is a April 11 - June 21, 2014 TV series directed by Jo Soo-Won(tvN Episodes 20) South Korea.
20 years ago Moo-Yeom’s ( Yoon Sang-Hyun ) father was a suspect in the "Gap Dong” serial murder case. Because of the detectives’ oppressive investigation, Moo-Yeom’s father killed himself.
Now, Moo-Yeom is a detective and works to capture the killer Gap Dong. The statue of limitations has expired for the serial murder case and Moo-Yeom resigns to the belief that Gap Dong is dead. New clues though for Gap Dong appears in front of Moo-Yeom and he sets out to catch him once and for all.