Park Hae-Young (Lee Je-Hoon) works as a criminal profiler and is also a police lieutenant. Even though he is a cop, he doesn’t trust cops due to his own experience. Later, Hae-Young and Soo-Hyun become teammate, they investigate the police cold case, which previous cases that have not been resolved until now. Then, Hae-Young and Jae-Han try to solve those cold cases together, even though they live in different times.
Diary-Stories 