Monster

Composer

• 
  Kim Jang Woo

Director

• 
  Joo Sung Woo

Screenwriter

• 
  Jang Young Chul
• 
  Jung Kyung Soon

Main Role

• 
  Kang Ji Hwan

  Kang Ki Tan

  Main Role
• 
  Sung Yoo Ri

  Oh Soo Yeon

  Main Role
• 
  Park Ki Woong

  Do Gun Woo

  Main Role
• 
  Claudia Kim

  Yoo Sung Ae

  Main Role

Support Role

• 
  Jin Tae Hyun

  Do Kwang Woo

  Support Role
• 
  Jeong Bo Seok

  Byun Il Jae

  Support Role
• 
  Lee El

  Ok Chae Ryung

  Support Role
• 
  Lee Deok Hwa

  Hwang Jae Man

  Support Role
• 
  Kim Bo Yeon

  Hwang Gwi Ja

  Support Role
• 
  Jo Bo Ah

  Do Shin Young

  Support Role
• 
  Kim Hye Eun

  Hwang Ji Soo

  Support Role
• 
  Park Young Gyu

  Do Chung

  Support Role
• 
  Go Yoon

  Cha Woo

  Support Role
• 
  Jung Woong In

  Moon Tae Kwang

  Support Role
• 
  Kim Won Hae

  Min Byeong Ho

  Support Role
• 
  Kang Han Saem

  Lee Soo Tak

  Support Role
• 
  Cha Kwang Soo

  Go Hae Sool

  Support Role
• 
  Shin Ju Hwan

  Park Hae Il

  Support Role
• 
  Jin Ye Sol

  Park So Hee

  Support Role
• 
  Lee Chae Mi

  Ye Bin [Choi Jin Hye's Daughter]

  Support Role
• 
  Lee Ah Hyun

  Choi Jin Hye

  Support Role
• 
  Park Hoon

  Oh Choong Dong

  Support Role
• 
  Jung Soon Won

  Cha Dong Soo

  Support Role
• 
  Song Kyung Chul

  Kong Bok Shin [Butler]

  Support Role
• 
  Jung Sung Mo

  Uh Kyung Suk

  Support Role
• 
  Jung Kyu Soo

  So Gil Doo

  Support Role
• 
  Go In Beom

  Kim Dae Woo

  Support Role
• 
  Shin Seung Hwan

  Yang Dong Yi

  Support Role
• 
  Lee Seung Hyung

  Secretary Ahn

  Support Role
• 
  Lee Moon Jung

  Hong Nan Jung

  Support Role
• 
  Lee Kyung Young Support Role
• 
  Sung Ki Yoon

  Professor Jin

  Support Role
• 
  Lee Gyu Sub

  [Henchman]

  Support Role
• 
  Lee Seung Hun Support Role
• 
  Kim Ji Sung

  [Child from the shop]

  Support Role
• 
  Kim Young Woong

  Yeom Hyeong Gu

  Support Role
• 
  Yoon Yong Joon

  Do Chi

  Support Role
• 
  Uhm Hye Soo

  Cha Jung Eun

  Support Role
• 
  Kim Min Seo

  Aide

  Support Role
• 
  Lee Woon San

  Prosecutor Park

  Support Role
• 
  Lee Suk Koo Support Role
• 
  Kim Tae I

  Wi Ryong

  Support Role
• 
  Lee Ga Ryeong

  Hong Ee Jin

  Support Role

Guest Role

• 
  Lee Gi Kwang

  Lee Kook Chul [Young]

  Guest Role
• 
  Lee Yeol Eum

  Cha Jung Eun [Young]

  Guest Role
• 
  Sung Ji Ru

  Ko Ju Tae

  Guest Role
• 
  Bae Jong Ok

  Jung Man Ok (Ep. 1-2)

  Guest Role
• 
  Chen Bo Lin

  Michael Chang

  Guest Role
• 
  Yang Hee Myung

  [Henchman]

  Guest Role
• 
  Kim Jin Woo

  Park Je Soo [Do Shin Young's blind date](Ep.34)

  Guest Role
• 
  Carson Allen

  Jessica [Gun Woo's classmate from US]

  Guest Role
• 
  Joey Albright

  John Rems

  Guest Role
• 
  Kim Myung Soo

  [Jung Eun and Dong Soo's father]

  Guest Role
• 
  Lee Won Jong

  Na Do Kwang [Doctor]

  Guest Role
• 
  Nam Gi Ae

  [Gook Chul's mother]

  Guest Role
• 
  Nam Myeong Ryeol

  Lee Joon Shik [Kook Chul's father]

  Guest Role
• 
  Choi Jong Won

  Jo Ki Ryang

  Guest Role
• 
  Kim Se Ah

  Mo Kyung Shin

  Guest Role
• 
  Hong Seung Beom

  Team Leader Park

  Guest Role
• 
  Min Jung Sup Guest Role
• 
  Seo In

  [Himself]

  Guest Role
• 
  Jeong Soo Hyun Guest Role
• 
  Ahn Won Jin Guest Role
• 
  Kang Dong Yup Guest Role
• 
  Yeo Woon Bok Guest Role
• 
  Kwon Hyuk Soo Guest Role
• 
  Son Gun Woo

  [Researcher]

  Guest Role
• 
  Choi Dae Sung Guest Role
• 
  Kim Tae Young Guest Role
• 
  Lee Chang

  [Dodo Hotel Manager]

  Guest Role
• 
  Kim Gwang In Guest Role
• 
  Hong Seo Joon Guest Role
• 
  Jung Hyun Seok

  [Doctor]

  Guest Role
• 
  Geum Kwang San

  [Loan shark]

  Guest Role
• 
  Kim Yoon Tae Guest Role
• 
  Kang Shin Chul Guest Role
• 
  Park Sang Hwi

  [Army Lieutenant]

  Guest Role
• 
  Cha Sang Mi Guest Role
• 
  Jung Myung Kyun

  [Breechblock agent]

  Guest Role
• 
  Won Geun Hee Guest Role
• 
  Seol Chang Hee Guest Role
• 
  Sung Nak Kyung Guest Role
• 
  Jeon Hae Ryong Guest Role
• 
  Jung Myung Joon Guest Role
• 
  Ham Jin Sung

  [Prison guard]

  Guest Role
• 
  Cha Soon Hyung

  Liu

  Guest Role
• 
  Sul Ji Yoon Guest Role

Unknown

• 
  Choi Hong Il Unknown
• 
  Morishita Yoshiyuki Unknown
• 
  Park Geon Rak Unknown
• 
  Jeon Jin Ki Unknown
• 
  Son Seon Geun Unknown
• 
  Lim Jae Min Unknown
• 
  Choi Tae Ju Unknown
• 
  Son Min Woo Unknown
• 
  Park Seong Kyun Unknown
• 
  Son Jung Rim Unknown
• 
  Choi Young Unknown

Bit part

• 
  Yoon Jong Won

  [Bodyguard]

  Bit part