Moment at Eighteen

Director

• 
  Shim Na Yeon

Executive Producer

• 
  Oh Hwan Min

Screenwriter

• 
  Yoon Kyung Ah

Main Role

• 
  Ong Seong Wu

  Choi Jun Woo

  Main Role
• 
  Kim Hyang Gi

  Yu Soo Bin

  Main Role
• 
  Shin Seung Ho

  Ma Hwi Young

  Main Role
• 
  Kang Ki Young

  Oh Han Gyul

  Main Role

Support Role

• 
  Lee Seung Min

  Lee Ki Tae [Jun Woo's classmate]

  Support Role
• 
  Kim Do Wan

  Cho Sang Hoon [Jun Woo's classmate]

  Support Role
• 
  Moon Bin

  Jung Oh Je [Jun Woo's friend]

  Support Role
• 
  Jung Young Joo

  Park Geum Ja [Hwi Young's mother]

  Support Role
• 
  Han Sung Min

  Hwang Ro Mi [Soo Bin's classmate]

  Support Role
• 
  Sung Ki Yoon

  Ma Yoon Gi [Hwi Young's father]

  Support Role
• 
  Kim Sun Young

  Yoon Song Hee [Soo Bin's mother]

  Support Role
• 
  Shim Yi Young

  Lee Yun Woo [Jun Woo's mother]

  Support Role
• 
  Park Sung Geun

  Lee Guan Yong [Vice Principal]

  Support Role
• 
  Heo Young Ji

  Kim Ji Min [Part-timer]

  Support Role
• 
  Moon Joo Yeon

  Yoon So Ye [Soo Bin's classmate]

  Support Role
• 
  Kim Ga Hee

  Moon Chan Yeol [Soo Bin's classmate]

  Support Role
• 
  Yoo In Soo

  Yoo Pil Sang [Jun Woo's classmate]

  Support Role
• 
  Shin Ki Joon

  Ha Shim Bok

  Support Role
• 
  Lee Do Hyun

  [Sang Hoon's father] (Ep.8)

  Support Role
• 
  Kim Bo Yun

  Kwon Da Hin [Soo Bin's classmate]

  Support Role
• 
  Baek Jae Woo

  Go Dong

  Support Role
• 
  Lee Hae Young

  Yu Jong Soo [Soo Bin's father] (Ep.9-10, 12)

  Support Role
• 
  Choi Ga In

  [Tutor]

  Support Role
• 
  Chae Hee Su

  [Broadcasting staff]

  Support Role
• 
  Kim So Hee

  [Broadcasting staff]

  Support Role
• 
  Woo Joon Seo

  Park Gyu Nam

  Support Role

Guest Role

• 
  Choi Jae Woong

  Choi Myeong Joon [Jun Woo's father] (Ep.2, 13-14)

  Guest Role
• 
  Lee Shi Woo

  Ma Whi Young [Young] (Ep. 9)

  Guest Role
• 
  Choi Dae Hoon

  Son Je Yeong [Mathematics Teacher] (Ep.1, 4, 6-8)

  Guest Role
• 
  Song Geon Hee

  Shin Jeong Hu [Jun Woo's best friend] (Ep. 3-4)

  Guest Role
• 
  Lee Seung Il

  Joo Hyun Jang

  Guest Role
• 
  Ri Min

  [Part-timer at a Convenience Store] (Ep. 1, 3, 6-7)

  Guest Role
• 
  Choi Woo Sung

  Lim Gun Hyuk [Byungmun High School] (Ep.3-5)

  Guest Role
• 
  Kim Kwang Shik

  [Oh Je's father] (Ep.5-8)

  Guest Role
• 
  Jung Hyun Joon

  Choi Joon Woo [Child] (Ep.2-3, 5, 14)

  Guest Role
• 
  Kim Ji Woo

  Shin Jeong Hu [Child] (Ep.3, 5)

  Guest Role
• 
  Lee Hwa Jung

  [Soo Bin's Bodyguard] (Ep.13-14)

  Guest Role
• 
  Kang Hoon

  [Ma Hwi Young's older brother] (Ep.16)

  Guest Role
• 
  Son Kyung Won

  [Ro Mi's father]

  Guest Role
• 
  Min Jung Sup Guest Role
• 
  Choi Yeon Ho Guest Role
• 
  Jeon Hyun Sook Guest Role
• 
  Jeon Jin Seo Guest Role
• 
  Seo Jeong Uk

  [Student]

  Guest Role
• 
  Jung Se Hyun

  [Female student]

  Guest Role
• 
  Kim Nu Rim

  [High School student]

  Guest Role