Hierarchy

Composer

• 
  Kim Tae Seong

Director

• 
  Bae Hyun Jin

Screenwriter

• 
  Choo Hye Mi

Main Role

• 
  Roh Jeong Eui

  Jung Jae I

  Main Role
• 
  Lee Chae Min

  Kang Ha

  Main Role
• 
  Kim Jae Won

  Kim Ri An

  Main Role
• 
  Ji Hye Won

  Yun He Ra

  Main Role
• 
  Lee Won Jung

  Lee U Jin

  Main Role

Support Role

• 
  Chae Seo An

  Han Ji Su [Teacher]

  Support Role
• 
  Choi Won Young

  Jug Gi Yeong [Jae I’s dad]

  Support Role
• 
  Yoon Se Ah

  An Hye Won [Ri An's mom]

  Support Role
• 
  Bae Hae Seon

  Park Hui Seon [Principal]

  Support Role
• 
  Lee Seung Joon

  Yun Byeong Geun [He Ra's dad]

  Support Role
• 
  Kim Min Chul

  Kang In Han

  Support Role
• 
  Seo Bum June

  Nam Ju Won

  Support Role
• 
  Lee Min Goo

  Baek Chan Min [Senior scholarship student]

  Support Role
• 
  Kwon Eun Bin

  Gil Ye Ji [He Ra's friend]

  Support Role
• 
  Kim Tae Jung

  Choi Yun Seok [Ri An's right hand man]

  Support Role
• 
  Pyo Young Seo

  Ryu Ba Da [He ra's friend]

  Support Role
• 
  Kim Jun Hyung

  Jung Jae Hyeok [Jae I's step brother]

  Support Role
• 
  Seo Jun

  Kim Seon U

  Support Role
• 
  Hyun Jin

  Lee Song I [U Jin's mom]

  Support Role
• 
  Lee Na Ra

  Song In Gyeong

  Support Role
• 
  Lee Do Guk

  Lee Han Jong [U Jin's dad]

  Support Role
• 
  Park Sun Ah

  Min Gyeong Won

  Support Role
• 
  Oh Seung Hee

  Director Kim

  Support Role
• 
  Yun Seok Ho

  Park Tae Ho

  Support Role

Guest Role

• 
  Park Sang Jong

  [Prime minister] (Ep. 1)

  Guest Role
• 
  Lee Do Hye

  [Scholarship student] (Ep. 1)

  Guest Role
• 
  Lee Young Sook

  [Prime minister's wife] (Ep. 1)

  Guest Role
• 
  Lee Jin Hong

  [Special A class teacher] (Ep. 1)

  Guest Role
• 
  Kim Ha Jin

  [Maid] (Ep. 2)

  Guest Role
• 
  Hong Ru Hyeon

  [Teacher] (Ep. 2)

  Guest Role
• 
  Bang Min Sun

  [Teacher] (Ep. 2)

  Guest Role
• 
  Kim Gyeong Min

  [School affairs head] (Ep. 2)

  Guest Role
• 
  Kwak Ji Sook

  [Ye Ji's mom] (Ep. 3)

  Guest Role
• 
  Kim Joo Yeon

  [Ba Da's mom] (Ep. 3)

  Guest Role
• 
  Sung Ki Yoon

  Chairman Park (Ep. 3-4)

  Guest Role
• 
  Kang Hye Rin

  Yun He Ra [Child] (Ep. 4)

  Guest Role
• 
  Jeon Ji A

  Jeong Jae I [Child] (Ep. 4)

  Guest Role
• 
  Yoon Kwan Woo

  [Detective] (Ep. 5)

  Guest Role
• 
  Ko Na Yul

  [Water gun boy] (Ep. 6)

  Guest Role
• 
  Ma Jung Pil

  [Lawyer] (Ep. 7)

  Guest Role
• 
  Kim Bum Suk

  [Detective] (Ep. 7)

  Guest Role
• 
  Kim Hwa Joong

  [Detective] (Ep. 7)

  Guest Role
• 
  Jang In Ho

  [Detective] (Ep. 7)

  Guest Role
• 
  Oh Na Ra

  [Jooshin High School new principal] (Ep. 7)

  Guest Role
• 
  Park Se Hoon

  [He Ra's driver]

  Guest Role
• 
  Jung Young Hoon

  [Hye Won's secretary]

  Guest Role
• 
  Ju Ye Eun

  [Special english class teacher]

  Guest Role