Lee Byung-hun as Kim Soo-hyun, an agent in the National Intelligence Service[6] Choi Min-sik as Jang Kyung-chul, an academy bus driver and serial killer Oh San-ha as Jang Joo-yun, Soo-hyun's fiancée Jeon Gook-hwan as Squad Chief Jang, Joo-yun's father Kim Yoon-seo as Jang Se-yun, Joo-yun's sister Chun Ho-jin as Section Chief Oh, the leader of the police Choi Moo-sung as Tae-joo, Kyung-chul's friend Kim In-seo as Se-jung, Tae-joo's girlfriend Yoon Chae-young as Han Song-yi, nurse Nam Bo-ra as Section Chief Oh's daughter