It doesn't matter how long. Five boys reunited every century so they could meet again. And one of them was always the center.

When a young woman is murdered for no apparent reason (no enemies, no large sums of money or insurance, etc.), it is up to detectives Kibum and Taemin to find the murderer. Going through various clues and notes left by the victim, Kibum and his partner find probable cause for her death - but when the killer turns out to be someone the police squad is familar with, will they be able to put their emotions aside and their