
Plot
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.
Trailer
Cast

Lee Byung-hun
Kim Soo-hyeon

Choi Min-sik
Kyung-chul

Jeon Kuk-hwan
Squad Chief Jang

Cheon Ho-jin
Section Chief Oh

Oh San-ha
Joo-yeon

Kim Yoon-seo
Se-yeon

Nam Bo-ra
Section Chief's Daughter

Lee Jun-hyuk
NIS Agent

Yoon Chae-yeong
Nurse Han Song-i

Choi Moo-seong
Tae-joo

Kim In-seo
Se-jung

Kim Kap-soo
Planning Team Deputy Head

Um Tae-goo
Detective

Choi Jin-ho
Planning Director

Mi-nam Jeong
Gangster in Taxi

Jo Deok-jae
Detective Kang

Jang Jeong-won
Kyung-chul's Son

Park Seo-yeon
Woman at Pension

Lee Seol-gu
Gangster in Taxi

Kim Yeong-chan
Young Pharmacist

Goo Yong-wan
Corporal

Kim Dae-hye
Hospital Worker

Kim Jae-geon
Old Doctor

Park Ji-yeon
Teacher

Son Young-soon
Kyung-chul's Mother

Nam Hyeon-joo
Section Chief Oh's Wife

Han Chul-woo
Detective Park

Sin Jeong-hoon
Policeman at Stream

Han Se-joo
Woman on Bus

Park Jeong-gi
Sergeant

Jo Myeong-yeon
Detective

Kim Bong-soo
Kyung-chul's Father

Kim Kang-il
Park Han-gi

Sin Sin-Beom
Old Pharmacist

Seol Chang-hee
Detective

Yoon Byung-hee
Jang-goo

Jung Tae-sung
Hotel Agent

Jang In-seo
Student