Hwayi: A Monster Boy

Cinematography

• 
  Kim Ji Yong

Composer

• 
  Mowg

Director

• 
  Jang Joon Hwan

Editor

• 
  Kim Sang Bum

Music Editor

• 
  Jang Hyuk Jin

Producer

• 
  Lee Chang Dong
• 
  Lee Dong Joon
• 
  Lee Dong Ha

Screenwriter

• 
  Park Joo Seok

Visual Effects

• 
  Jo Yong Seok
• 
  Choi Jae Cheon
• 
  Jung Do An
• 
  Lee Jeon Hyoung

Main Role

• 
  Kim Yoon Seok

  Yoon Seok Tae

  Main Role
• 
  Yeo Jin Goo

  Hwa Yi

  Main Role
• 
  Jo Jin Woong

  Yoon Ki Tae

  Main Role
• 
  Jang Hyun Sung

  Lee Jin Sung

  Main Role
• 
  Kim Sung Kyun

  Lee Dong Bum

  Main Role
• 
  Park Hae Joon

  Lee Bum Soo

  Main Role

Support Role

• 
  Nam Ji Hyun

  Seo Yoo Kyung [Hwa Yi's neighbor]

  Support Role
• 
  Yoo Yeon Seok

  Park Ji Won [Jeon Seung Gi's right-hand man & PA]

  Support Role
• 
  Woo Jung Kook

  [Blind masseur]

  Support Role
• 
  Im Ji Eun

  Jang Yeong Ju [Hwa I's "mama"]

  Support Role
• 
  Kim Young Min

  Choi Jung Min / "Ddolchung" [Detective]

  Support Role
• 
  Seo Young Hwa

  Kim Seon Ja [Im Hyung Taek's wife]

  Support Role

Guest Role

• 
  Lee Kyung Young

  Im Hyung Taek

  Guest Role
• 
  Moon Sung Keun

  Jeon Seung Gi [JNU chairman, former gang leader]

  Guest Role
• 
  Park Yong Woo

  Chang Ho [Chief of Criminal Division, Incheon]

  Guest Role

Bit part

• 
  Park Jin U

  Detective Jang

  Bit part
• 
  Han Chul Woo

  Detective Kim

  Bit part
• 
  Min Bok Gi

  [Middle-aged former prosecutor]

  Bit part
• 
  Kim Rok Kyung

  [Private security guard]

  Bit part
• 
  Im Hyung Taek

  [Chief of Detective Division]

  Bit part
• 
  Son Kang Gook

  [DUI crackdown police]

  Bit part
• 
  Han Yi Jin

  [DUI crackdown police]

  Bit part
• 
  Park Sung Joon

  [Disorderly student]

  Bit part
• 
  Jang In Sub

  Chang Ho [Rookie detective]

  Bit part
• 
  Park Kyung Hye

  [Paju Agricultural Cooperative employee]

  Bit part
• 
  Park Min Young

  [Paju Hospital nurse]

  Bit part
• 
  Kwon Eun Soo

  [Paju Hospital nurse]

  Bit part
• 
  Lee You Mi

  [Yoo Kyung's friend]

  Bit part
• 
  Park Gyoo Ri

  [Yoo Kyung's friend]

  Bit part
• 
  Jo Sung Hee

  [Truck driver in front of school]

  Bit part
• 
  Han Joo Wan

  [Former chairman's aide]

  Bit part
• 
  Jo Soo Jung

  [Former chairman's secretary

  Bit part
• 
  Jung Yoon Suk

  Hwa Yi [Child]

  Bit part
• 
  Jang Sung Bum

  Yoon Seok Tae [Young]

  Bit part
• 
  Kim Seung Yoon

  Jang Young Joo [Young]

  Bit part
• 
  Lee Jin Sung

  [Incheon Hospital support staff]

  Bit part
• 
  Sung Do Hyun

  [Lime factory support staff]

  Bit part
• 
  Seol U Sin

  [Lime factory support staff]

  Bit part
• 
  Kim Dae Kyung

  [Lime factory support staff]

  Bit part
• 
  Park Sang Hoon

  [Lime factory support staff]

  Bit part
• 
  Lee Sun Goo

  [Lime factory support staff]

  Bit part
• 
  Shin Sung Kyun

  [Dangerous man on Line 1]

  Bit part
• 
  Kim Jong Tae

  [Detective on Line 1]

  Bit part
• 
  Kim Joo Hwang

  [Detective on Line 1]

  Bit part
• 
  Kim Min Seok

  [Detective on Line 1]

  Bit part
• 
  Eom Ji Man

  [Detective on Line 3]

  Bit part
• 
  Im So Mi

  [Cherry Bar girl]

  Bit part
• 
  Kim Geun Yeong

  [Im Hyung Taek's mother]

  Bit part
• 
  Lee Seung Yong

  [Lime factory support staff]

  Bit part
• 
  Lee Joon Hyuk

  [Redevelopment complex police]

  Bit part
• 
  Park Geon Gyu

  [Redevelopment complex police]

  Bit part
• 
  Jung Do Won

  [Construction worker]

  Bit part
• 
  Choi Yong Hyun

  [Construction worker]

  Bit part
• 
  Kim Hong Pa

  [Incheon mayor]

  Bit part
• 
  Park Myung Shin

  Assemblyman Jeong

  Bit part