Weak Hero Class 1

Composer

• 
  Primary

Director

• 
  Park Dhan Hee

Screenwriter & Director

• 
  Yoo Su Min

Main Role

• 
  Park Ji Hoon

  Yeon Si Eun / Gray Yeon

  Main Role
• 
  Choi Hyun Wook

  An Su Ho / Stephen An

  Main Role
• 
  Hong Kyung

  O Beom Seok / Bryce O

  Main Role
• 
  Kim Su Gyeom

  Jeon Yeong Bin / Oswald Yang

  Main Role

Support Role

• 
  Lee Yeon

  Yeong I

  Support Role
• 
  Shin Seung Ho

  Jeon Seok Dae

  Support Role
• 
  Hwang Sung Bin

  Han Tae Hun

  Support Role
• 
  Cha Woo Min

  Kang U Yeong [UFC player]

  Support Role
• 
  Yoon Jung Hoon

  Lee Jeong Chan

  Support Role
• 
  Na Chul

  Kim Gil Su

  Support Role
• 
  Park Jung Hoon

  Hung Gyu

  Support Role
• 
  Yeom Ji Young

  [Grade 1 Class 6 homeroom teacher]

  Support Role
• 
  Shin Jun Chul

  [Korean literature teacher]

  Support Role
• 
  Gong Hyun Joo

  [Yeon Si Eun's mother]

  Support Role
• 
  Kim Sung Kyun

  [Yeon Si Eun's father]

  Support Role
• 
  Jo Han Chul

  O Jin Won [Beom Seok's father]

  Support Role
• 
  Oh Dong Min

  [O Jin Won's aide]

  Support Role
• 
  Jo Yong Geun

  [O Jin Won's secretary]

  Support Role
• 
  Lee Jae Hak

  [Gang member]

  Support Role
• 
  Jang Myung Jin

  [PE teacher]

  Support Role
• 
  Gong Jun Ho Support Role

Guest Role

• 
  Cha Sung Je

  Sung Chan [Jeon Seok Dae's 'little brother']

  Guest Role
• 
  Jo Ah Young

  [Yeong Bin's friend] (Ep. 1)

  Guest Role
• 
  Sin Ga Ram

  [Yeong Bin's friend] (Ep. 1)

  Guest Role
• 
  Lee Hyun Bae

  [Yeong Bin's friend] (Ep. 1)

  Guest Role
• 
  Yu Seong Yong

  [Baseball player] (Ep. 1)

  Guest Role
• 
  Oh Su Yun

  [Yeong Bin's mother] (Ep. 2)

  Guest Role
• 
  Jang Dae Ung

  Kim Won Seok (Ep. 2-3)

  Guest Role
• 
  Kim Hyuk Jong

  [Police officer 1] (Ep. 3)

  Guest Role
• 
  Kang Jun Young

  [Police officer 2] (Ep. 3)

  Guest Role
• 
  Kim Tae Joon

  [Police officer 3] (Ep. 4)

  Guest Role
• 
  Pyun Hae Joon

  Kim Hui Jun (Ep. 5)

  Guest Role
• 
  Park Sang Eun

  [Jeong Chan's friend] (Ep. 5)

  Guest Role
• 
  Kim Hoe Chang

  [Bully] (Ep. 5)

  Guest Role
• 
  Jang Jae Ha

  Yeon Si Eun [Child] (Ep. 7)

  Guest Role
• 
  Yoo Soo Bin

  Choi Hyo Man [Eunjang High School bully] (Ep. 8)

  Guest Role
• 
  Byun Jung Hee

  [An Su Ho's grandmother] (Ep. 8)

  Guest Role
• 
  Kim Hyun

  [School principal] (Ep. 8)

  Guest Role
• 
  Lee Hae Woon

  [Homeroom teacher] (Ep. 8)

  Guest Role
• 
  Kim Kyung Min

  Lee Hyeon Min

  Guest Role
• 
  Chun Myung Woo

  Crong

  Guest Role
• 
  Kang Min Soo

  [Math teacher]

  Guest Role
• 
  Jang Tae Hyun

  [Long haired guy]

  Guest Role
• 
  Park Jae Hwi

  [Gang member]

  Guest Role
• 
  Jin Hui Gyu

  [Byeoksan high school student]

  Guest Role
• 
  Seo Dong Gyu

  [Gang member]

  Guest Role
• 
  Jeon Gang Ho

  [Gang member]

  Guest Role