The Defects

Director

• 
  Oh Ki Hwan

Main Role

• 
  Yeom Jung Ah

  Kim Se Hui

  Main Role
• 
  Won Jin A

  Kim A Hyeon

  Main Role
• 
  Choi Young Joon

  Woo Tae Sik

  Main Role
• 
  DEX

  Jung Hyeon

  Main Role

Support Role

• 
  Ahn Ji Ho

  Ju An

  Support Role
• 
  Lee Na Eun

  So Mi

  Support Role
• 
  Oh Seung Jun

  Seok Su

  Support Role
• 
  Kang Ji Yong

  Choi Si U [Abandoned child]

  Support Role
• 
  Kim Ji An

  Kim A Hyeon [Se Hui's daughter]

  Support Role
• 
  Do Yu

  Gyu Tae [Jung Hyeon's aide]

  Support Role
• 
  Son Jong Hak

  Kwon Gang Man

  Support Role
• 
  Song Young Gyu

  Yun Se Hun [Pastor]

  Support Role
• 
  Jeon Shin Hwan

  Choi Hyeong Seok [Detective]

  Support Role

Guest Role

• 
  Kim Yong Jin

  [Reporter] (Ep. 1)

  Guest Role
• 
  Jo Eun Sol

  [Orphan girl] (Ep. 1)

  Guest Role
• 
  Kim Jin Uk

  [Gambling den staff] (Ep. 1)

  Guest Role
• 
  Choi Yoo Ha

  Park Min Ju [Si U's mother] (Ep. 1, 3, 8)

  Guest Role
• 
  Shin Yeon Woo

  Kim A Hyeon [Young] (Ep. 1-5)

  Guest Role
• 
  Kim Young Joon

  Choi Hyeon Gyu [Si U's father] (Ep. 1, 8)

  Guest Role
• 
  Lim Jae Myung

  Han Cheol Su [So Mi's father] (Ep. 2-3)

  Guest Role
• 
  Bae Min Hee

  Im Gyeong Mi [So Mi’s mother] (Ep. 2-3, 8)

  Guest Role
• 
  Park Ha Jun

  Jung Hyeon [Young] (Ep. 3)

  Guest Role
• 
  Kim Yu Jun

  Ju Eun Gyeol [Student] (Ep. 5)

  Guest Role
• 
  Kang Hak Soo

  Jun Jae Du [Police commissioner] (Ep. 6, 8)

  Guest Role
• 
  Cho Yu Ha

  Eun Jo (Ep. 7-8)

  Guest Role
• 
  Park Ji Yun

  Kim Na Yeon [Eun Jo's mother] (Ep. 7-8)

  Guest Role
• 
  Lee Jae Woo

  Seo Hun [Eun Jo's father] (Ep. 7-8)

  Guest Role
• 
  Kim Ro Sa

  Jang Jin Gyeong [Do Hyeon's mother] (Ep. 7-8)

  Guest Role
• 
  Kim Ok Joo

  Choi Seong Sil (Ep. 7-8)

  Guest Role
• 
  Kim Ji Yoo

  Kim Se Hui [Young] (Ep. 7-8)

  Guest Role
• 
  Oh Sa Rang

  [Adoptive mother] (Ep. 7-8)

  Guest Role
• 
  Han Soo Yeon

  [First lady]

  Guest Role
• 
  Hong Ju Won

  [Funeral reporter]

  Guest Role
• 
  Do Yeon

  [Classmate]

  Guest Role
• 
  Kim Byung Jo Guest Role

Cameo

• 
  Kim Soo Ro

  Gwak Dong Cheol [Refund processor] (Ep. 1-2)

  Cameo
• 
  Yoo Seung Mok

  [Smuggling broker] (Ep. 2, 5)

  Cameo
• 
  Lee Min Woo

  [Se Hui's husband] (Ep. 4)

  Cameo
• 
  Sung Hoon

  [President] (Ep. 4-5, 8)

  Cameo
• 
  Hwang Seok Jeong

  [Doctor] (Ep. 5, 7)

  Cameo

Unknown

• 
  Song Kyo Hyeon Unknown