Kyung-chul is a dangerous psychopath who kills for pleasure. Soo-hyeon, a top-secret agent, decides to track down the murderer himself. He promises himself that he will do everything in his power to take vengeance against the killer, even if it means that he must become a monster himself.
Kim Soo-hyeon
Kyung-chul
Squad Chief Jang
Section Chief Oh
Joo-yeon
Se-yeon
Section Chief's Daughter
NIS Agent
Nurse Han Song-i
Tae-joo
Se-jung
Planning Team Deputy Head
Detective
Planning Director
Gangster in Taxi
Detective Kang
Kyung-chul's Son
Woman at Pension
Gangster in Taxi
Young Pharmacist
Corporal
Hospital Worker
Old Doctor
Teacher
Kyung-chul's Mother
Section Chief Oh's Wife
Detective Park
Policeman at Stream
Woman on Bus
Sergeant
Detective
Kyung-chul's Father
Park Han-gi
Old Pharmacist
Detective
Jang-goo
Hotel Agent
Student
Taxi driver
