The Merciless

설경구

Han Jae-ho

임시완

Jo Hyun-su

김희원

Byung-gab

전혜진

In-sook

이경영

Byung-chul

Moon Ji-yoon

Young-geun

Jang In-sub

Min-chul

김지훈

Jung-sik

김성오

Seung-pil

진선규

Prison Chief Security Officer

허준호

Kim Sung-han

신소율

Osean Trading Advertisement Beauty 1

김보미

Osean Trading Advertisement Beauty 2

이미소

Osean Trading Advertisement Beauty 3

최병모

Captain Choi

Andreas Fronk

Russian Mafia

이시훈

Jae-ho's Subordinate

최준영

Yong-chan