The Merciless

Sul Kyung-gu

Han Jae-ho

Yim Si-wan

Jo Hyun-su

Kim Hie-won

Byung-gab

Jeon Hye-jin

In-sook

Lee Kyung-young

Byung-chul

Moon Ji-yoon

Young-geun

Jang In-sub

Min-chul

Kim Ji-hoon

Jung-sik

Kim Seung-o

Seung-pil

Jin Sun-kyu

Prison Chief Security Officer

Huh Joon-ho

Kim Sung-han

Shin So-yul

Osean Trading Advertisement Beauty 1

Kim Bo-mi

Osean Trading Advertisement Beauty 2

Lee Ru-ahn

Osean Trading Advertisement Beauty 3

Choi Byung-mo

Captain Choi