One Ordinary Day

Director

• 
  Lee Myung Woo

Screenwriter

• 
  Kwon Soon Gyu

Main Role

• 
  Kim Soo Hyun

  Kim Hyeon Su

  Main Role
• 
  Cha Seung Won

  Shin Joong Han

  Main Role

Support Role

• 
  Lee Seol

  Seo Soo Jin [Rookie lawyer]

  Support Role
• 
  Kim Shin Rok

  Ahn Tae Hee [Elite prosecutor]

  Support Role
• 
  Kim Hong Pa

  Park Sang Beom [Seoul Central police station, violent crime unit's head]

  Support Role
• 
  Kim Sung Kyu

  Do Ji Tae [Northern Prison convict]

  Support Role
• 
  Yang Kyung Won

  Park Doo Shik [Northern Prison convict]

  Support Role
• 
  Seo Jae Hee

  Park Mi Kyung [Bumhan Law Firm attorney]

  Support Role
• 
  Yoo Seung Mok

  Jung Sang Soo [Northern Prison convict]

  Support Role
• 
  Yoo Hee Je

  "Bone-setter" [Northern Prison convict]

  Support Role
• 
  Sung Nak Kyung

  Song Baek Ho [Northern Prison convict]

  Support Role
• 
  Lee Hyun Kul

  Kim Jin Man [Northern Prison staff]

  Support Role
• 
  Kim Young Ah

  Hong Jung Ah [NFS staff]

  Support Role
• 
  Moon Ye Won

  Kang Da Kyung

  Support Role
• 
  Han Dong Won

  [Detective]

  Support Role
• 
  Park Yoon Hee

  Kim Jung Jae [Hyun Soo's father]

  Support Role
• 
  So Hee Jung

  Hong Ae Kyung [Hyun Soo's mother]

  Support Role

Guest Role

• 
  Park Bong Seo

  Ha No Seok (Ep. 1)

  Guest Role
• 
  Kim Nak Gyun

  [Police officer at Seoul Central] (Ep. 1)

  Guest Role
• 
  Shin Hee Gook

  [Police officer at Seoul Central] (Ep. 1)

  Guest Role
• 
  Oh Jin Seok

  [Detective at Seoul Central] (Ep. 1)

  Guest Role
• 
  Kim Gwan Mo

  [Police officer at Seoul Central] (Ep. 1-2)

  Guest Role
• 
  Kang Pil Sun

  [Detective at Seoul Central] (Ep. 1-2)

  Guest Role
• 
  Lee Jae In

  [Crime scene investigator] (Ep. 1-2, 5)

  Guest Role
• 
  Kim Yun Jeong

  Park Han Byul [Police officer] (Ep. 1-2, 6)

  Guest Role
• 
  Hwang Se On

  Hong Guk Hwa [Taxi passenger] (Ep. 1-2, 4, 6)

  Guest Role
• 
  Park No Kyeong

  Cho Hyun Ho [Seoul Central Police] (Ep. 1, 6)

  Guest Role
• 
  Hwang Sang Kyung

  Lee Chul Ho (Ep. 1, 6-7)

  Guest Role
• 
  Lee Soo Gwang

  Yoo Seung Hun (Ep. 1-2, 8)

  Guest Role
• 
  Park Jae Wan

  [Judge] (Ep. 2)

  Guest Role
• 
  Yang Hee Woo

  [Bus pervert] (Ep. 2)

  Guest Role
• 
  Park Chan Woo

  Lee Young Chan [Joong Han's client] (Ep. 2)

  Guest Role
• 
  Yoon Hyo Sik

  Yoo Tae Han [Police officer at Seoul Central (Ep. 2)

  Guest Role
• 
  Choi Hee Jin

  [Judge] (Ep. 2)

  Guest Role
• 
  Jung Ji Ho

  [Medical examiner] (Ep. 2, 5)

  Guest Role
• 
  Yun Hae Bin

  Shin Hye In [Joong Han's family] (Ep. 2, 5)

  Guest Role
• 
  Shin Wu Cheol

  Jo Gang Pil (Ep. 2, 5, 8)

  Guest Role
• 
  Kim Mi Hye

  [Northern Prison doctor] (Ep. 3)

  Guest Role
• 
  Park Sang Hwi

  [Prosecutor] (Ep. 3)

  Guest Role
• 
  Kim Kyu Baek

  [Wimp] (Ep. 3)

  Guest Role
• 
  Seo Young Sam

  [Doctor] (Ep. 3)

  Guest Role
• 
  Park So Yoon

  [Northern Prison doctor] (Ep. 3, 5)

  Guest Role
• 
  Ha Young Jin

  [Northern Prison guard] (Ep. 3, 5)

  Guest Role
• 
  Bae Gi Beom

  [Confinement review judge] (Ep. 4)

  Guest Role
• 
  Seo Wang Seok

  [Violent guy] (Ep. 4)

  Guest Role
• 
  Han Seung Do

  [NFS polygraph examiner] (Ep. 4)

  Guest Role
• 
  Seo Kwang Jae

  [Acupuncturist] (Ep. 4)

  Guest Role
• 
  Moon Soo Young

  Park Chan Yeol (Ep. 4, 8)

  Guest Role
• 
  Jeon Gyu Il

  [Judge presiding Chrysanthemum case trial] (Ep. 4-8)

  Guest Role
• 
  Lee Yo Sung

  Kim Jung Soo (Ep. 5)

  Guest Role
• 
  Na Eun Saem

  Yoon Hyo Jeong (Ep. 5-8)

  Guest Role
• 
  Kim Hyung Mook

  [Prosecutor] (Ep. 6)

  Guest Role
• 
  Woo Jeong Won

  [Investigator] (Ep. 6)

  Guest Role
• 
  Kim Moon Ho

  [Delivery company employee] (Ep. 6)

  Guest Role
• 
  Lee Pung Woon

  Uhm Gi Jong (Ep. 6-7)

  Guest Role
• 
  Lee Sung Il

  [News program analyst] (Ep. 7)

  Guest Role
• 
  Seon Yul U

  [Prisoner] (Ep. 7)

  Guest Role
• 
  Park Jong Bum

  [Prisoner] (Ep. 7)

  Guest Role
• 
  Kim You Jung

  [Holding cell girl] (Ep. 8)

  Guest Role
• 
  Shin Si Ye

  Kim Ji Soo [Hyun Soo's younger sister]

  Guest Role
• 
  Shin Ye Seo

  [Kim Hyun Soo's sister]

  Guest Role
• 
  Lee Ro Woon

  [Prison guard]

  Guest Role

Unknown

• 
  Kang Hyo Seung Unknown
• 
  Yoo Seong Hyun Unknown