Don Lee as Mark

Kwon Yul as Jin-ki

Han Yeri as Soo-jin

Choi Seung-hoon as Joon-hyung

Ok Ye-rin as Joon-hee

Son Sook as Mark's Mother

John D. Michaels as Fight Announcer

Carson Allen as Announcer

Lee Kyu-ho as Punch

Derek Chouinard as Club Goer

No Ji-yoo as Exhibition Hall Reporter

Jeon Gwon-ha as Prison Punch Opponent

Yang Hyun-min as Yoo Chang-soo

Nam Yeon-woo as Team Leader Kim

Kang Shin-hyo as Combo

Kang Seung-hyun as Joo-yun

Park Sun-ho as Jason Kim

Oh Chang-kyung as Event Announcer

Yoo Soon-woong as Doctor Han

Park Hyung-Soon as Chang-soo's Employee

Park Won Bin as Busan MC

Park Seong-il as PD Park

Kim Jong-goo as Jin-gi's Father

Yu Seung-ok as Celebrity

Park Se-jun as Chang-soo's Employee

Choi Hye-jin as Jason Kim's Gang

Park Tae-yun as Soccer Boy

Ahn Sung-min as Foreign Car Driver

Yang Jo-a as English Elementary Student's Mother

Park Chan-woo as Cigarette Student

Park Ji-yeon as Busan Couple

Hwang Sang-kyung as Busan Couple

Kwak Ja-hyung as Macho Driver

Yoon Eun-ji as Gambling Joint Cashier

Jeon Hye-won as High School Student

Baek Sang-hee as Airport Greeting Woman

Kim Dong-hyun as Celebrity

Yoo Ji-yeon as Sun-kyeong's Sister

Park Kwang-jae as 2 Meter Giant

Kim Ji-hwan as Child on Bus

Kim Geon as Busan Arm Wrestling Elementary School Student

Jin Mo as Combo Team Member 1

Geum Gwang-san as Combo Team Member 2

Lee Su-jeong as Cashier