Believer

Art Director

• 
  Lee Ha Jun

Cinematography

• 
  Kim Tae Gyeong

Composer

• 
  Dalpalan

Costume Designer

• 
  Choi Se Yeon

Editor

• 
  Yang Jin Mo

Executive Producer

• 
  Kim Woo Taek
• 
  Kim Young Hoon

Makeup Artist

• 
  Jang Yoon Jung

Producer

• 
  Jeong Hui Sun

Screenwriter

• 
  Jung Seo Kyung

Screenwriter & Director

• 
  Lee Hae Young

Visual Effects

• 
  Kang Jong Ik
• 
  Lee Seung Min

Main Role

• 
  Jo Jin Woong

  Jo Won Ho

  Main Role
• 
  Ryu Jun Yeol

  Seo Young Rak

  Main Role
• 
  Kim Joo Hyuk

  Jin Ha Rim

  Main Role
• 
  Kim Sung Ryung

  Oh Yun Ok

  Main Role
• 
  Park Hae Joon

  Park Seon Chang

  Main Role

Support Role

• 
  Nam Moon Chul

  Choi Jung Tae

  Support Role
• 
  Jin Seo Yun

  Bo Ryung

  Support Role
• 
  Kang Seung Hyun

  Kim So Yun

  Support Role
• 
  Seo Hyeon Woo

  Lee Jung Il

  Support Role
• 
  Jung Ga Ram

  Dong Woo

  Support Role
• 
  Lee Joo Young

  Joo Young

  Support Role
• 
  Kim Dong Young

  Dong Young

  Support Role
• 
  Keum Sae Rok

  Cha Soo Jung

  Support Role
• 
  Jung Jun Won

  Kang Duk Cheon

  Support Role

Guest Role

• 
  Cha Seung Won

  Brian Lee

  Guest Role
• 
  Chris Chan

  [Father of Seo Young Rak]

  Guest Role

Bit part

• 
  Shin Hee Gook

  [Laboratory employee]

  Bit part
• 
  Lee Ji Min

  [Cart worker]

  Bit part
• 
  Park Sung Yun

  [Interpreter]

  Bit part
• 
  Geum Kwang San

  [Ha Rim's henchman]

  Bit part
• 
  Kim Tae Joon

  Young Bae

  Bit part
• 
  Jang Tae Min

  Doctor Soo [Veterinarian]

  Bit part
• 
  Yoon Suk Ho

  Seo Young Rak [Young]

  Bit part
• 
  Seo Jin Won

  [SWAT team]

  Bit part
• 
  Park Hyun Ji

  [ER Doctor]

  Bit part
• 
  Kim Jae Hoon

  [SWAT team]

  Bit part
• 
  Yoon Tae In

  [Ha Rim's henchman]

  Bit part
• 
  Jung Jong Woo

  [Brian's entourage]

  Bit part
• 
  Kim Joon Hyung

  [Brian's entourage]

  Bit part
• 
  Ahn Sung Bong

  [Brian's Entourage]

  Bit part
• 
  Hwang Ki Suk

  [Paramedic]

  Bit part
• 
  Cha Soon Hyung

  [Brian's entourage]

  Bit part
• 
  Kwon Do Woon

  [Plain clothes police]

  Bit part
• 
  Na Ki Soo

  Lee Hak Seung

  Bit part
• 
  Park Jang Jin

  [Ha Rim's henchman]

  Bit part
• 
  Yoon Taek Seung

  [Incheon Factory Management]

  Bit part
• 
  Lee Jung Chul

  [Incheon Factory Management]

  Bit part
• 
  Choi Young Min

  [ER doctor #2]

  Bit part
• 
  Kwon Hyuk Sung

  [Incheon factory executive]

  Bit part
• 
  Baek Seung Hwan

  [Incheon Factory Management]

  Bit part
• 
  Kim Dae Geun

  [Jin Ha Rim's henchman]

  Bit part
• 
  Park Eun Young

  Yook Pil Soon

  Bit part
• 
  Hyun Young Kyun

  [Plain clothes gatekeeper]

  Bit part
• 
  Han Sang Chul

  [Seo Yeong Rak's father]

  Bit part
• 
  Heo Na Kyung

  [Emergency Room Nurse 1]

  Bit part
• 
  Lee Jung Ho

  [Ha Rim's henchman]

  Bit part
• 
  Park Jin Soo

  [Bully girl]

  Bit part
• 
  Chu Yeon Gyu

  [Laboratory staff]

  Bit part
• 
  Kim Young Joo

  [Incheon factory executive]

  Bit part
• 
  Hwang Bo Jeong Il

  [Ha Rim's Henchman]

  Bit part
• 
  Ok Il Jae

  [Security point employee]

  Bit part
• 
  Kim Si Kook

  [Security guard]

  Bit part
• 
  Lim Wook Jin

  [Ha Rim's subordinate]

  Bit part
• 
  Yoon Jane

  [Anchor]

  Bit part
• 
  Kim Noo Ri

  [Young Rak's mother]

  Bit part