Room No. 9

Composer

• 
  Jung Se Rin

Director

• 
  Ji Young Soo

Screenwriter

• 
  Jung Sung Hee

Main Role

• 
  Kim Hee Sun

  Eulji Hae Yi

  Main Role
• 
  Kim Hae Sook

  Jang Hwa Sa

  Main Role
• 
  Kim Young Kwang

  Ki Yoo Jin

  Main Role

Support Role

• 
  Lee Kyung Young

  Ki San [CEO]

  Support Role
• 
  Oh Dae Hwan

  Oh Bong Sam [Detective]

  Support Role
• 
  One

  Ki Chan Sung [Ki San's son]

  Support Role
• 
  Kim Jae Hwa

  Kam Mi Ran [Hwa Sa's best friend]

  Support Role
• 
  Jung Won Joong

  Ma Hyeon Cheol

  Support Role
• 
  Jung Yeon Joo

  Han Hyun Hee

  Support Role
• 
  Im Won Hee

  Bang Sang Su

  Support Role
• 
  Min Sung Wook

  So Young Chul

  Support Role
• 
  Kang Shin Il

  Eulji Seong

  Support Role
• 
  Son Sook

  [Jang Hwa Sa's mother]

  Support Role
• 
  Son Byung Ho

  Kim Jong Soo

  Support Role
• 
  Yoon Bak

  Gi San [Young]

  Support Role
• 
  Jung Suk Yong

  Kang Sung Tae

  Support Role
• 
  Kim Jong Gu

  Gi Se Woong [Gi Yoo Jin's father]

  Support Role
• 
  Park Hyun Jung

  Kim Hye Sun

  Support Role
• 
  Ahn Suk Hwan

  Bong Sa Dal

  Support Role
• 
  Park Sung Geun

  Lee Sang Hee

  Support Role
• 
  Park Ok Chool

  ['Sister' Inmate #2661]

  Support Role
• 
  Yang Ji Il

  Park Eun Sung [Park Chul Soon's son]

  Support Role
• 
  Choi Ga In

  [Inmate #3457]

  Support Role
• 
  Jang Haet Sal

  [Inmate #5478]

  Support Role
• 
  Kim Jung Young

  [Inmate #822]

  Support Role
• 
  Lee Su Ryeon

  [Inmate #4982]

  Support Role
• 
  Jo Won Hee

  Park Chul Soon

  Support Role
• 
  Jung Yoo Min

  Jang Hwa Sa [Young]

  Support Role
• 
  Ahn Hyun Ho

  Ma Soo Ji [Hyeon Cheol's daughter]

  Support Role
• 
  Kwak Na Yeon

  [Kim Jong Soo's wife]

  Support Role
• 
  Kim Si Eun

  Kim Hye Seon [Young]

  Support Role
• 
  Lee Choong Goo

  Bong Sa Dal [Youth]

  Support Role

Guest Role

• 
  Jung Dong Gyu

  [Lawyer] (Ep.1)

  Guest Role
• 
  Koo Ja Sung

  [Police officer] (Ep. 2)

  Guest Role
• 
  Jung Hyun Seok

  [Physician] (Ep. 2)

  Guest Role
• 
  Song Yoon Ah

  Park Hyun Jung (Ep. 16)

  Guest Role
• 
  Seo Kwang Jae

  [Judge]

  Guest Role
• 
  Hong Seok Cheon

  [Chief]

  Guest Role
• 
  Lee Hyun Bin

  Yoo Jin [Child]

  Guest Role
• 
  Son Young Soon

  [Park Yeon Jeong's mother]

  Guest Role
• 
  Joey Albright

  [Physiognomist]

  Guest Role
• 
  Uhm Tae Yoon

  [Shot a toy gun at Yoo Jin in the hospital]

  Guest Role
• 
  Joo Byung Ha

  [Flirting male university student]

  Guest Role
• 
  Seo Hye Jin

  [Investigator]

  Guest Role
• 
  Heo Woong

  Police Sergeant Park

  Guest Role
• 
  Na Seok Min

  [Convoy]

  Guest Role
• 
  Kim Mi Hye

  [Reporter]

  Guest Role
• 
  Han Soo Ho

  [Investigator]

  Guest Role
• 
  Sim So Yeon

  [Park Chul Soon's wife]

  Guest Role
• 
  Shin Won Ho

  [Song Han Byul's boyfriend]

  Guest Role
• 
  Han Jae Yi

  Esther Ki

  Guest Role
• 
  Bae Yoo Ri Guest Role
• 
  Kam Rain Guest Role
• 
  Myung Seok Geun Guest Role
• 
  Kwon Hyuk Soo Guest Role
• 
  Kim Jung Seok Guest Role
• 
  Jung Kang Hee Guest Role
• 
  Jung Dong Geun Guest Role
• 
  Jo Ryeon Guest Role
• 
  Kim Young Ah Guest Role
• 
  Jo Si Nae Guest Role
• 
  Kim Nam Ho

  [Traffic cop]

  Guest Role

Unknown

• 
  Lee Hae Woon Unknown
• 
  Cha Rae Hyoung Unknown
• 
  Han Yeo Wool Unknown
• 
  Yoon Se Eun Unknown
• 
  Kwon Yoo Na Unknown
• 
  Lee Ki Sub Unknown
• 
  Ryu In Young Unknown
• 
  Ha Min Unknown
• 
  Choi Young Unknown