Idol: The Coup

Director

• 
  Noh Jong Chan

Screenwriter

• 
  Jung Yoon Jung

Main Role

• 
  Ahn Hee Yeon

  "Jenna" / Kim Je Na

  Main Role
• 
  Ahn Sol Bin

  "Hyun Ji" / Oh Hyun Ji

  Main Role
• 
  Han So Eun

  "Stella" / Jang Stella

  Main Role
• 
  EXY

  "L" / Kang Yu Ri

  Main Role
• 
  Ryu Ji Won

  "Chae A" / Park Chae Ah

  Main Role
• 
  Kwak Shi Yang

  Cha Jae Hyuk

  Main Role
• 
  Kim Min Kyu

  Seo Ji Han

  Main Role

Support Role

• 
  Cho Jun Young

  "Ray" / Han Sun Woo [Mars member]

  Support Role
• 
  Baek Seo Hoo

  "Tae Young" / / Park Tae Young [Mars member]

  Support Role
• 
  Hong Eun Ki

  "Yul" / Kim Yul [Mars member]

  Support Role
• 
  Lee Eun Sang

  "Dan" / Park Eun Dan [Mars member]

  Support Role
• 
  Cha Sun Woo

  Troy

  Support Role
• 
  Ahn Se Ha

  Yoon Se Yul

  Support Role
• 
  Kim Kyung Il

  Assistant Manager Park

  Support Role
• 
  Lee Soo In

  [StarPeace Entertainment Staff]

  Support Role
• 
  Lee Yoo Jin

  Bbiyong [Producer]

  Support Role
• 
  Jung Woong In

  Ma Jin Woo [CEO]

  Support Role
• 
  Kang Jae Joon

  Jin Doo Ho [Manager]

  Support Role
• 
  Park Si Hyun

  Ae Rin [Hyun Ji's Friend]

  Support Role
• 
  Park Joon Soo

  Ko Seok Chun

  Support Role
• 
  Kim Ye Ji

  Romy [Highteen]

  Support Role
• 
  Oh Su Yun

  Lee Ju Yeon [Assistant manager]

  Support Role

Guest Role

• 
  Jang Sung Kyu

  Jang Sung Kyu [Radio host] (Ep. 1)

  Guest Role
• 
  BIG Naughty

  [Himself] (Ep. 1)

  Guest Role
• 
  Narsha

  [Herself] (Ep. 1)

  Guest Role
• 
  Jang Young Hyun

  [Producer] (Ep. 1)

  Guest Role
• 
  Choi Yo Woon

  [Audience member] (Ep. 1)

  Guest Role
• 
  Lim Seo Won

  Hyun Ji [Young] (Ep. 2)

  Guest Role
• 
  Kim Jin Geun

  Park Seong Jin [CEO] (Ep. 2, 6-7, 9)

  Guest Role
• 
  Son Suk Bae

  [Hyun Ji's father] (Ep. 2)

  Guest Role
• 
  Kim Byung Chun

  [Management director] (Ep. 2)

  Guest Role
• 
  Lee Yo Sung

  [Fast food restaurant manager] (Ep. 2, 11)

  Guest Role
• 
  Kim Ji In

  So Yeon [KillA] (Ep. 3, 7-8, 12)

  Guest Role
• 
  Song Hoon

  [Chief] (Ep. 3)

  Guest Role
• 
  Jung Yoon Hee

  [Film production member] (Ep. 3)

  Guest Role
• 
  Jeong Yoon Hee

  [Film production member] (Ep. 3)

  Guest Role
• 
  Kim Ki Yeon

  [L's mother] (Ep. 4)

  Guest Role
• 
  Park Sang Hwi

  [Culture Foundation staff] (Ep. 5)

  Guest Role
• 
  Yoon Sung Hyuk

  [Bbiyong's friend] (Ep. 5)

  Guest Role
• 
  Kwon Dong Won

  [Dormitory staff] (Ep. 5, 7)

  Guest Role
• 
  Shin Jae Hoon

  Mo Ga Jin [Reporter] (Ep. 5, 8-9, 11-12)

  Guest Role
• 
  Kim So Eun

  [Troy's employee] (Ep. 6)

  Guest Role
• 
  Yoon Bok In

  Dr. Cha (Ep. 7-8)

  Guest Role
• 
  Park Joon Sang

  [Management company CEO] (Ep. 8)

  Guest Role
• 
  Kang Cho Won

  [Mars fan] (Ep. 9-10)

  Guest Role
• 
  Lia Kim

  Lia Kim (Ep. 10)

  Guest Role
• 
  Son Byung Ho

  Kim Ho Young (Ep. 10-11)

  Guest Role
• 
  Kim Min Joon

  Seo Ji Han [Young] (Ep. 10)

  Guest Role
• 
  Lee Ga Yeon

  Kim Jung Yeon [Kim Ho Young's Daughter] (Ep. 11)

  Guest Role
• 
  Oh Jung Yeon

  [Interviewer] (Ep. 11)

  Guest Role
• 
  Oh Yoon Hong

  [Stella's mother] (Ep. 11)

  Guest Role
• 
  Lee Joong Yul

  Gyeong Tak (Ep. 12)

  Guest Role
• 
  Eun Seo

  [Herself; Music Tank MC] (Ep. 12)

  Guest Role
• 
  Kang Min Hee

  [Himself; Music Tank MC] (Ep. 12)

  Guest Role
• 
  Kyung Ki Hyun

  [Vlogger] (Ep. 12)

  Guest Role
• 
  Son Sook

  [Hyun Ji's grandmother] (Ep. 12)

  Guest Role
• 
  Lee Chang Won Guest Role
• 
  Park Jun Hyuk

  Cha Jae Hyuk [Teen] (Ep. 10)

  Guest Role
• 
  Raiden

  [Himself] (Ep. 1)

  Guest Role
• 
  Kim Jeong Nam

  [Audience member] (Ep. 1)

  Guest Role
• 
  Kim A Yul

  [Idol fan] (Ep. 11)

  Guest Role
• 
  Kim Jin Kyu

  [Reporter] (Ep. 9-10)

  Guest Role
• 
  Jang Eun Seo

  Seong Ji Hye [Writer] (Ep. 1, 10)

  Guest Role
• 
  Kim Han Sol

  Seo Ji Han [Child] (Ep. 10)

  Guest Role
• 
  Kim Joon Ho Guest Role

Unknown

• 
  Choi Hyoung Uk Unknown
• 
  Park Min Jae Unknown
• 
  Bang Jin Won Unknown
• 
  Jung Tae Ryung Unknown
• 
  Kwon Tae Hee Unknown