When I Was the Most Beautiful

Director

• 
  Oh Kyung Hoon
• 
  Song Yeon Hwa

Screenwriter

• 
  Jo Hyun Kyung

Main Role

• 
  Im Soo Hyang

  Oh Ye Ji

  Main Role
• 
  Kim Ji Soo

  Seo Hwan

  Main Role
• 
  Ha Seok Jin

  Seo Jin

  Main Role
• 
  Hwang Seung Eon

  Carry Jung

  Main Role

Support Role

• 
  Park Ji Young

  Kim Yeon Ja [Hwan & Jin's mother]

  Support Role
• 
  Stephanie Lee

  Amber [Hwan's friend]

  Support Role
• 
  Choi Jong Hwan

  Seo Seong Geun [Hwan and Jin's father]

  Support Role
• 
  Kim Mi Kyung

  Kim Go Un [Ye Ji's mother]

  Support Role
• 
  Shin Yi

  Oh Ji Young

  Support Role
• 
  Jung Eun Pyo

  Lee Kyung Shik

  Support Role
• 
  Kim Noh Jin

  Lee Chan Hee

  Support Role
• 
  Jeon Yu Lim

  Jung Da Woon [Hwan's friend]

  Support Role
• 
  Son Bo Seung

  Baek Jung Il [Hwan's friend]

  Support Role
• 
  Joo In Young

  Hong Il Hwa [Da Un's mother]

  Support Role
• 
  Kwon Hyuk

  Kim Yeon Chul [Yeon Ja's brother]

  Support Role
• 
  Seo Eun Woo

  Yoon Ji Yang [Yeon Ja's secretary]

  Support Role
• 
  Lee Dong Ha

  Ryu Seung Min [Attorney / Ye Ji's ex-boyfriend]

  Support Role
• 
  Lee Jae Yong

  Bang Young Geun [Chairman]

  Support Role
• 
  Kim Tae Gyum

  Kang Ki Seok

  Support Role
• 
  Jung Wook Jin

  Park Woo Geun

  Support Role
• 
  Lee Seung Il

  Song In Ho [Hwan's friend]

  Support Role
• 
  Jung Ae Ri Support Role

Guest Role

• 
  Kim Jung Tae

  [Ye Ji's father]

  Guest Role
• 
  Joey Albright

  Sam (Ep.1, 3)

  Guest Role
• 
  Kim Do Hye

  Oh Ye Ji [Child]

  Guest Role
• 
  Park Min Sang

  Seo Jin [Teen]

  Guest Role
• 
  Shin Dam Soo

  [Song In Ho's father] (Ep.3)

  Guest Role
• 
  Hwang Geum Byul

  [Song In Ho's mother] (Ep.3)

  Guest Role
• 
  Park Yong

  [Construction foreman] (Ep. 3)

  Guest Role
• 
  Lee Ju Mi

  [Go Woon’s co-worker]

  Guest Role
• 
  Han Tae Il

  Kang Hae Sol

  Guest Role
• 
  Kim Yoon Joo

  [Redevelopment project employee]

  Guest Role
• 
  Jung Dong Gyu

  [Doctor]

  Guest Role
• 
  Yoo Yong

  [Doctor] (Ep. 11)

  Guest Role
• 
  Kim Gyeong Min

  [Prosecutor]

  Guest Role
• 
  Hwang Joo Ho

  [Doctor] (Ep.10-11)

  Guest Role
• 
  Kim Young Sun

  [Teacher]

  Guest Role
• 
  Lee Bum Chan

  [Delivery man] (Ep.3)

  Guest Role
• 
  Kwak Na Yeon

  [Real Estate broker]

  Guest Role
• 
  Ma Hyun Ji

  [Student]

  Guest Role
• 
  Lim Jae Myung

  [Kim Go Woon's boss]

  Guest Role
• 
  Lee Sang Hee

  [Kim Go Woon's co-worker]

  Guest Role
• 
  Bret Allan Lindquist

  Mark (Ep. 5)

  Guest Role
• 
  Gi Hwan

  [Paramedic]

  Guest Role
• 
  Lee Jae Eun

  [Kim Go Woon's co-worker]

  Guest Role
• 
  Lee Chul

  [Redevelopment project team leader] (Ep. 8. 16)

  Guest Role
• 
  Seo Jin Won

  Park Dong Hyun

  Guest Role
• 
  Joshua Newton

  Mechanic (Ep. 5)

  Guest Role
• 
  Lee Hyun Seok

  J

  Guest Role
• 
  Bong Ki Han

  [Board member] (Ep. 10-11)

  Guest Role
• 
  Kim Young Mi

  [Nurse]

  Guest Role
• 
  Jung Hee Young

  [Bus passenger] (Ep. 1)

  Guest Role

Unknown

• 
  Jin Shi Won Unknown