Kim Soo-hyun

as Jang Tae-yeong

Sung Dong-il

as Jo Won-geun

Lee Sung-min

as Choi Jin-gi

Sulli

as Song Yoo-hwa

Jo Woo-jin

as Sa Do-jin

Kim Hong-pa

as Choi Nak-hyeon

Jeong In-kyeom

as Professor Kim

Choi Kwon

as Manager Baek

Ko Kyu-pil

as Bald man

Han Ji-eun

as Han Ye-won

Jung Yi-seo

as Addict

Lee Jung-hyun

as Gangster in Chinatown

Son Hyun-joo

as Patient

Park Seo-jun

as Bodyguard

Kim Da-som

as Therapist

An So-hee

as Restaurant Waitress

Suzy

as Tatuist

Gyeongree

as Waitress

Park Min-ha

as Waitress

Ah Ri

as Brothel Men-Women

Ji Eun-seo

as Secret Room Club Addict 1

Lee Chae-dam

as Secret Room Club Addict 2

Lee Kyung-young

as No-yeom

Yoon Kyung-ho

as Broker

Lee Gi-dong

as Chief Police Officer

Kim Song-il

as Capital CEO

Kim Hye-hwa

as Im Ra-hee

IU

as Awards Ceremony Guide

Jason Scott Nelson

as Max

Lim Dong-yoon

as Meatpacking Factory Worker

Hyun Bong-sik

as Chinese Restaurant Employee

Oh Ji-young

as Private Gambling Place Madame