Pyramid Game

Art Director

• 
  Cho Hwa Sung

Director

• 
  Park So Yeon

Music Director

• 
  Park Gyu Jung
• 
  Lee Hwi Min

Screenwriter

• 
  Choi Soo Yi

Main Role

• 
  Bo Na

  Seong Su Ji

  Main Role
• 
  Jang Da A

  Baek Ha Rin

  Main Role
• 
  Ryu Da In

  Myung Ja Eun

  Main Role
• 
  Kang Na Eon

  Im Ye Rim

  Main Role

Support Role

• 
  Jung Ha Dam

  Ko Eun Byeol

  Support Role
• 
  Ha Yul Ri

  Bang U I

  Support Role
• 
  Hwang Hyun Jeong

  Kim Da Yun

  Support Role
• 
  Shin Seul Ki

  Seo Do A

  Support Role
• 
  Lee Ju Yeon

  Sim Eun Jeong

  Support Role
• 
  Oh Se Eun

  Song Jae Hyeong

  Support Role
• 
  Kim Se Hee

  Pyo Ji Ae

  Support Role
• 
  Son Ji Young

  Ra Hae Jun

  Support Role
• 
  Kim Ye Na

  Jung Yeon Du

  Support Role
• 
  Kwon I Su

  Joo Seung I

  Support Role
• 
  Jeong Ji Soo

  Yang So Yeong

  Support Role
• 
  Choi Sung Won

  Im Ju Hyeong

  Support Role
• 
  Ahn So Yo

  Yun Na Hui

  Support Role
• 
  Son Ji Na

  Lim Sun Ae [Principal]

  Support Role
• 
  Jung Ae Yeon

  Choi I Hwa [Ha Rin's mother]

  Support Role
• 
  Jo Dong In

  Jo Seung Hwa [Convenience store part-time worker]

  Support Role
• 
  Jung Seung Kil

  Seo Jung Yun [Do A's father]

  Support Role
• 
  Choi Yoon Seo

  Koo Seul Ha

  Support Role
• 
  Kwon Tae Hee

  Sin Sin Ye

  Support Role
• 
  Lee Da Kyung

  Yun Ye Won

  Support Role
• 
  Kim Min Ji

  Jo Yu Rim

  Support Role
• 
  Lee Gyu Seon

  Park Ji Yeong

  Support Role
• 
  Kim Bi Bi

  Teacher Hong

  Support Role
• 
  Son Woo Hyeok

  Teacher Kim

  Support Role
• 
  Lee Si Young

  Teacher Park

  Support Role
• 
  Jeon Sa Ra

  Teacher Choi

  Support Role
• 
  Jun Joon Woo

  Teacher Jeon

  Support Role
• 
  Kim Young Pil

  Baek Hyeon Jun

  Support Role
• 
  Jung Gi Sub

  Kim Byeong O

  Support Role
• 
  Yoon Na Eun

  Choi Yu Hyeon

  Support Role
• 
  Song Si An

  O Seong A

  Support Role
• 
  Do Ji Woo

  Cha Seon Ju

  Support Role
• 
  Cho Yu Jin

  Teacher An

  Support Role

Guest Role

• 
  Shin Su A

  Bo A (Ep. 3)

  Guest Role
• 
  Jeon Seong A

  [Yeon Du's mother] (Ep. 4)

  Guest Role
• 
  Jang Eui Don

  Sang Gu (Ep. 6)

  Guest Role
• 
  Lee Se Rang

  [Sang Gu’s wife] (Ep. 6)

  Guest Role
• 
  Hwang Ji A

  [Field trip student] (Ep. 8)

  Guest Role
• 
  Yang Ha Yoon

  [Reporter] (Ep. 9)

  Guest Role
• 
  Uhm Tae Ok

  [Military officer] (Ep. 9)

  Guest Role
• 
  Jang Gyu Ri

  Lee Su Min [Miryo Group twins] (Ep. 10)

  Guest Role
• 
  Won Gun Su

  [Judo coach] (Ep. 10)

  Guest Role
• 
  Je Seung Hyun

  [Private tutor] (Ep. 10)

  Guest Role
• 
  Oh Jin Ha

  [Kindergarten teacher] (Ep. 10)

  Guest Role
• 
  Joo Bo Young

  Jo U Ri

  Guest Role
• 
  Seo Gyung Hwa

  Kang Sun Hui

  Guest Role
• 
  Choi Dae Chul

  Sung Hui Seok

  Guest Role
• 
  Nam Gi Ae

  Byeon Cho Sun

  Guest Role
• 
  Jeon Ji A

  Baek Ha Rin [Young]

  Guest Role
• 
  Park So Eul

  Seong Su Ji [Young]

  Guest Role
• 
  Lee Chae Bin

  Myung Ja Eun [Young]

  Guest Role
• 
  Kim So Woon

  [Eun Byeol’s mom]

  Guest Role
• 
  Song A Kyung

  [Da Yeon’s mother]

  Guest Role
• 
  Baek Cho A

  [School nurse]

  Guest Role
• 
  Choi Ha Won

  [Student]

  Guest Role
• 
  Choi Yeon Hwa

  Kang Sun Yu [Reporter] (Ep. 10)

  Guest Role
• 
  Lim Su Hwan

  [Police officer] (Ep. 9-10)

  Guest Role

Unknown

• 
  Kim Ah Young Unknown