Zhao Fei’er is the leader of the newly set up Special Crime Investigation Department. Zhu Yilong,

“Let him go! It’s me you want.”  - These were the first words Chanyeol heard, when he was about to be executed for murder. Little did he know that these words would save his life.

It has been 3 years since the Crucifix's incident and Im Yoona went to the UK under Lee Gikwang's referral to continue her studies and finally become a skilled Criminal Psychologist, Criminal Profiler, and detective. With Song Dongwoon's help, she was able to recover from her past incident.

8 years after Eunji's leave to London, Korea's Seoul Medical University Hospital have called her back as a last year resident. 8 years ago, she faced the death of her fiance, Nam Woohyun, and her good friend, CAP. She had moved on from the past, but she made sure she won't make the same mistake ever again. Kinda leaving a trauma in her.

Jeong Inseong loves working as a junior detective for the Seoul Metropolitan Police Agency. The job is tough, he has to obey orders from the seniors, but he isn't complaining. It was what he always wanted to do. But when the entire nation goes into panic mode over the supposed reappearance of a serial killer, Inseong finds himsel