Twenty years ago, Moo-Yeom’s father was a suspect in the "Gap Dong” serial murder case. Under the pressure of the detectives’ relentless investigation, Moo-Yeom’s father took his own life. Now, Moo-Yeom is a detective determined to catch the elusive killer, Gap Dong. With the statute of limitations expired on the serial murder case, Moo-Yeom had resigned himself to the belief that Gap Dong was dead. However, new clues surface, prompting Moo-Yeom to embark on a mission to apprehend him once and for all.














