The WONDERfools

Composer

• 
  Kim Tae Seong

Director

• 
  Yoo In Shik

Original Creator

• 
  Kang Eun Kyung

Screenwriter

• 
  Heo Da Jung

Main Role

• 
  Park Eun Bin

  Eun Chae Ni

  Main Role
• 
  Cha Eun Woo

  Lee Un Jeong

  Main Role
• 
  Kim Hae Sook

  Kim Jeon Bok

  Main Role
• 
  Choi Dae Hoon

  Son Gyeong Un

  Main Role
• 
  Im Sung Jae

  Kang Ro Bin

  Main Role

Support Role

• 
  Son Hyun Joo

  Ha Un Do [Wunderkinder leader]

  Support Role
• 
  Bae Na Ra

  Kim Pal Ho

  Support Role
• 
  Jeong E Suh

  Seok Ju Ran

  Support Role
• 
  Choi Yun Ji

  Seok Ho Ran

  Support Role
• 
  Kang Gi Doong

  Yang Seok U [Civil servant]

  Support Role
• 
  Lee Soo Bin

  Kim Na Yeong [Seok U's junior]

  Support Role
• 
  Kim Jung Yeon

  Moon Mi Hui [Gyeong Un's wife]

  Support Role
• 
  Park Ye Rin

  Son Cheong [Gyeong Un's daughter]

  Support Role
• 
  Park Sung Geun

  Elder Yun [Elder of the Salvation Eternal Life Church]

  Support Role
• 
  Lee Soon Won

  Park Seung Ryeol [Police]

  Support Role
• 
  Cha Seo Won

  Koo Jun Mo [Jeon Bok's accomplice]

  Support Role
• 
  Kim Ki Cheon

  Ko Sang Mu [Former orphanage janitor]

  Support Role

Guest Role

• 
  Heo Jung Do

  Kwon Jun Bae [Attending physician] (Ep. 1-2)

  Guest Role
• 
  Hong Min Soo

  Kim Bong Pal (Ep. 1, 3)

  Guest Role
• 
  Kang Jun

  [City hall complaints employee] (Ep. 1, 3, 5, 8)

  Guest Role
• 
  Jung Hye Kyung

  [Landlord] (Ep. 1, 4)

  Guest Role
• 
  Hwang Eun Hoo

  [Church woman] (Ep. 1, 7-8)

  Guest Role
• 
  Park Young Bok

  [Recycler] (Ep. 2)

  Guest Role
• 
  Byun Woo Min

  [Loyal subject] (Ep. 2)

  Guest Role
• 
  Park Hui Eun

  [Sang Mu's wife] (Ep. 2)

  Guest Role
• 
  Oh Ji Yul

  Seok Ju Ran [Child] (Ep. 2, 4)

  Guest Role
• 
  Kim Man Ho

  [Sailor] (Ep. 2-3)

  Guest Role
• 
  Woo Sang Ki

  [Sailor] (Ep. 2-3)

  Guest Role
• 
  Shin Tae Yang

  Kim Pal Ho [Child] (Ep. 2-4)

  Guest Role
• 
  Choi Kwang Il

  Choi Yeong Jun [Experiment sponsor] (Ep. 2-3, 5)

  Guest Role
• 
  Lee Sae Ro Mi

  Ha Na (Ep. 2-4, 8)

  Guest Role
• 
  Jin Tae Yeon

  Du Na (Ep. 2-4, 8)

  Guest Role
• 
  Jin Mi Sa

  Won Ju (Ep. 2-4, 6, 8)

  Guest Role
• 
  Choi So Yool

  Seok Ho Ran [Child] (Ep. 2, 4-5)

  Guest Role
• 
  Seo Woo Jin

  "Child of Eternity" (Ep. 2-5, 7)

  Guest Role
• 
  Han Ji An

  Lee Un Jeong [Child] (Ep. 2-5, 7-8)

  Guest Role
• 
  Lee Il Hwa

  Jang Yun Hui [Un Jeong's mother] (Ep. 2, 6, 8)

  Guest Role
• 
  Jung Ji Ahn

  Nurse Um [Emergency room nurse] (Ep. 3)

  Guest Role
• 
  Oh Ki Hwan

  [Detective] (Ep. 3)

  Guest Role
• 
  Jang Yoon Woo

  [Anchorman] (Ep. 3)

  Guest Role
• 
  Jeong Bo Seok

  Nam Sun Gyu (Ep. 3, 6-7)

  Guest Role
• 
  Kwon Oh Soo

  Elder Choi (Ep. 4)

  Guest Role
• 
  Jung Young Joo

  [Aurora woman] (Ep. 4)

  Guest Role
• 
  Kim Si On

  Eun Chae Ni [Child] (ep. 5)

  Guest Role
• 
  Lee Dong Hyeon

  [Bully student] (Ep. 6)

  Guest Role
• 
  Hong Boo Hyang

  [Disabled man's mother] (Ep. 6)

  Guest Role
• 
  Seo Young Sam

  Park Byeong Jin [Police chief] (Ep. 6-7)

  Guest Role
• 
  Jung Dong Geun

  [Sun Gyu's secretary] (Ep. 7)

  Guest Role
• 
  Yook Hyun Suk

  [Sun Gyu's bodyguard] (Ep. 7)

  Guest Role
• 
  Choi Yo Han

  Mr. Heo (Ep. 7-8)

  Guest Role
• 
  Lee Juk

  [Radio DJ] (Ep. 8)

  Guest Role
• 
  Lee Yong Yi

  [Restaurant owner] (Ep. 8)

  Guest Role
• 
  Cho Bu Hyun

  [Snack diner owner] (Ep. 8)

  Guest Role
• 
  Ko Hoon Mok

  [Hardware store owner]

  Guest Role