Park Sung-woong

Kim Myeong-gil (season 1)

Kwon Seok-joo: a long-term prison inmate who turned himself in after personally killing the rapist of his eight-year-old daughter.

Kim Seon-joo: president of Silver Lining, an emerging IT company

Nam Tae-il, He is the Secretary-General of the Aemin Party and former Director of the ANSP.

Hwang Deuk-gu

North Korean taxi driver

Mo Tae-gang / Ryu, a top actor who is possessed by the devil Ryu, to whom Ha Rip sold his soul. Nam Da-reum as Ryu's true form

Yoo Jin-gook

(ep. 1)

Kang Dong-chul: Head of the Homicide Team. A detective who is uninterested in evidence and instead uses his keen instincts and intuition to solve his cases.

Yeo Woon-gwang

(Ep. 2)

Park Dong-ho

Jang Moo-won

Dong-jin (Leader of Dong-jin's Death Squad)

Kim Yushin

Seo In-chul

Choi Dong-kwan, Min Se-hwa's right-hand man and lover

Jo Jin-goo

Oh Kang-chul

Baek Sung-hyun

Jumuchi

Choi Joon-sik (older brother)