Yim Si-wan as Lee Han-wool / Mantis

Park Gyu-young as Shin Jae-yi

Choi Hyun-wook as Benjamin Jo

Bae Gang-hee as Yang Soo-min

Hwang Sung-bin as Puma Lee

Yoo Su-bin as Kim Dong-yeong

Jeon Bae-soo as Nam Bae-soo

Jo Woo-jin as Dok-go

Sul Kyung-gu as Cha Min-gyu

Jeon Do-yeon as Gil Bok-soon

Yang Dong-geun as Gwang-cheon / Bi-cheon

Kim Joon-bae as Mr. Bae

Park Kang-seop as Manager Yoo

Do Yu as Secretary

Ahn Seong-bong as M.K Information Desk Staff

Seo Ji-oh as Leaflet

Esom as Cha Min-hee (archive footage)

Koo Kyo-hwan as Han Hee-sung (archive footage)

Kim Seung-o as Shin (archive footage)

Lee Yeon as Kim Young-ji (archive footage)

Choi Byung-mo as Hyun-chul (archive footage)

Kim Ki-cheon as Su-guen (archive footage)

Park Kwang-jae as Gwang-man (archive footage)

Jang In-sub as Yoon-sub (archive footage)

Hwangbo Jung-il as Bar owner

Park Seok-won as Tatto man

Hwang Jin-woon as Young Han-wool

Park Gyu-bin as Young Jae-yi

Kim Chil-doo as Old man

Shin Sung-il as Protester

Ha Seon-jae as Bar friend

Ryu Seong-cheol as Ssang-bong

Oh Chi-woon as Cleaner

Aerok Kim as Tatto Killer

Jang In-seo as JB Enter. Killer

Han Sang-kyung as Airport Killer