Fifteen years ago, a brutal series of murders in City A left twelve-year-old Ye Hanchen an orphan...
Fifteen years later, a similar case occurred in City A. Lin Zhengguo, then director of the provincial public security bureau, immediately sent Ye Hanchen, now an outstanding criminal investigator, to join the investigation, hoping he would solve the old mystery himself. But as Ye Hanchen gradually dug into the case, he began to realize that there was more to what happened back then...
