Twenty-Five Twenty-One

Director

• 
  Jung Ji Hyun
• 
  Kim Seung Ho

Producer

• 
  Yun Ha Rim

Screenwriter

• 
  Kwon Do Eun

Main Role

• 
  Kim Tae Ri

  Na Hee Do

  Main Role
• 
  Nam Joo Hyuk

  Baek Yi Jin

  Main Role
• 
  Bo Na

  Go Yu Rim

  Main Role
• 
  Choi Hyun Wook

  Moon Ji Ung

  Main Role
• 
  Lee Joo Myung

  Ji Seung Wan

  Main Role

Support Role

• 
  Seo Jae Hee

  Shin Jae Kyung [Hee Do's mother / News anchor]

  Support Role
• 
  Kim Hye Eun

  Yang Chan Mi [Fencing team coach]

  Support Role
• 
  Joo Bo Young

  Lee Ye Ji [Tae Yang High School Fencing club member]

  Support Role
• 
  Lee Yea Jin

  Park Han Sol [Tae Yang High School Fencing club member]

  Support Role
• 
  Choi Myung Bin

  Kim Min Chae [Hee Do's daughter]

  Support Role
• 
  Kim So Hyun

  Na Hee Do [Older]

  Support Role
• 
  Choi Min Yeong

  Baek Yi Hyun [Yi Jin's younger brother]

  Support Role
• 
  Park Yoon Hee

  Baek Seong Hak [Yi Jin's father]

  Support Role
• 
  Kim Young Sun

  [Yi Jin's mother]

  Support Role
• 
  So Hee Jung

  [Seung Wan's mother]

  Support Role
• 
  Heo Ji Na

  [Yu Rim's mother]

  Support Role
• 
  Kim Dong Gyun

  [Yu Rim's father]

  Support Role
• 
  Lee Chan Jong

  Seo Jung Hyuk [UBS Network reporter]

  Support Role

Guest Role

• 
  Park Jin Soo

  Seo Hye Jin (Ep. 1)

  Guest Role
• 
  Jung Yoo Min

  Hwang Bo Mi (Ep. 1)

  Guest Role
• 
  Kim Tae Yoo

  Kim Yoo Jin [Bo Mi's friend] (Ep. 1)

  Guest Role
• 
  Lee Ki Bbeum

  [Bo Mi's friend] (Ep. 1)

  Guest Role
• 
  Song Young Joo

  [Bo Mi's friend] (Ep. 1)

  Guest Role
• 
  Yu Bee

  [Yi Jin's friend] (Ep. 1)

  Guest Role
• 
  Jang Young Hyun

  [Yi Jin's friend] (Ep. 1)

  Guest Role
• 
  Jang Yeon Woo

  [I Jin's friend] (Ep. 1)

  Guest Role
• 
  Jung Yong Ju

  [Delinquent boy] (Ep. 1, 4)

  Guest Role
• 
  Lee Ha Joo

  [Fencing team player] (Ep. 1)

  Guest Role
• 
  Lee Joong Ok

  [Seon Jung Girls' High Fencing club coach] (Ep. 1, 7)

  Guest Role
• 
  Yun Tae Yi

  [Seon Jung Girls' High School fencing team player] (Ep. 1, 7)

  Guest Role
• 
  Ri Min

  [Newspaper delivery subscriber / Chinese restaurant owner] (Ep. 1, 14)

  Guest Role
• 
  Shin Ga Eun

  Jang Chae Hee (Ep. 2)

  Guest Role
• 
  Im Yong Soon

  [Security guard] (Ep. 2)

  Guest Role
• 
  Kang Hak Soo

  [Loen Hotel employee] (Ep. 2)

  Guest Role
• 
  Park Boo Gun

  [Mr. Baek's ex-employee] (Ep. 2)

  Guest Role
• 
  Hyun Jin

  [Tae Yang High School teacher] (Ep. 2)

  Guest Role
• 
  Ma Jung Pil

  [Tae Yang High School Faculty member] (Ep. 2)

  Guest Role
• 
  Moon Woo Bin

  Kang Ji Soo [Tae Yang High School Fencing club member] (Ep. 2-4)

  Guest Role
• 
  Bang Eun Jung

  Lee Da Seul [Tae Yang High School Fencing club member] (Ep. 2-4)

  Guest Role
• 
  Ok Joo Ri

  [Ahyeon Supermarket owner] (Ep. 2, 4, 8, 11, 13)

  Guest Role
• 
  Jung Chung Gu

  [Myeongjin Book Rentals owner] (Ep. 2, 5, 16)

  Guest Role
• 
  Ok Ye Rin

  Na Hee Do [Young] (Ep. 2, 7, 11)

  Guest Role
• 
  Bae Seong Il

  [Mr. Baek's ex-employee] (Ep. 2, 8)

  Guest Role
• 
  Kim Beom Jun

  [Ji Woong's friend] (Ep. 2, 10, 12)

  Guest Role
• 
  Kyung Da Eun

  Go Yu Rim [Young] (Ep. 2, 11)

  Guest Role
• 
  Jo Nam Hee

  [Tae Yang High School Headmaster] (Ep. 2, 12)

  Guest Role
• 
  Jeon Se Yong

  [Passerby] (Ep. 3)

  Guest Role
• 
  Yoo Eun A

  [Elephant Snacks diner] (Ep. 3)

  Guest Role
• 
  Seo Young Sam

  [Korean history teacher] (Ep. 3)

  Guest Role
• 
  Seo Jung Bin

  Kim Jong Chan (Ep. 3, 5)

  Guest Role
• 
  Yeon Seung Bin

  Choi Won Hwan (Ep. 3, 5)

  Guest Role
• 
  Jeon Soo Hwan

  Mr. Kim [Han River C&T interviewer] (Ep. 4)

  Guest Role
• 
  Song Jae Saeng

  Ms. Son [Han River C&T interview host] (Ep. 4)

  Guest Role
• 
  Son Yeong Soon

  [Bus passenger] (Ep. 4)

  Guest Role
• 
  Hong Eun Jeong

  [Job interviewee] (Ep. 4)

  Guest Role
• 
  Koo Ja Keon

  [Job interviewee] (Ep. 4)

  Guest Role
• 
  Choi Gyo Shik

  [Neighbourhood man] (Ep. 4)

  Guest Role
• 
  Kim Nam Yee

  [Yi Jin's paternal aunt] (Ep. 4)

  Guest Role
• 
  Jang Joon Hyun

  [Yi Jin's acquaintance / Director of Han River C&T] (Ep. 4)

  Guest Role
• 
  Kim Ha Ru

  [National team fencer] (Ep. 4-5, 7)

  Guest Role
• 
  Lee Sun Goo

  [National fencing team coach] (Ep. 4-7)

  Guest Role
• 
  Jeon Young

  [Yogurt lady] (Ep. 4, 8)

  Guest Role
• 
  Lee Kyung Oh

  [UBS Network director] (Ep. 4, 11)

  Guest Role
• 
  Lee So Yoon

  Kim Min Chae [Young] (Ep. 5)

  Guest Role
• 
  Kim Na In

  [Mover] (Ep. 5)

  Guest Role
• 
  Lee Bum Chan

  [Referee] (Ep. 5)

  Guest Role
• 
  Kook Joong Woong

  [Referee] (Ep. 5)

  Guest Role
• 
  Kim Nak Gyun

  [Detective] (Ep. 5)

  Guest Role
• 
  Lee Jae Woo

  [Photo studio owner] (Ep. 5)

  Guest Role
• 
  Lee Dong Gyu

  [UBS Network Sports anchor] (Ep. 5-7)

  Guest Role
• 
  Jung Hyung Suk

  Kim Hak Gyu [UBS Sports department head] (Ep. 5-7, 9-13)

  Guest Role
• 
  Park Jung Pyo

  [Yi Jin's maternal uncle] (Ep. 5, 9-11)

  Guest Role
• 
  Seok Hee

  Sawaguchi [Japanese national team fencer] (Ep. 6)

  Guest Role
• 
  Kim Ji Ho

  [MBS TV network employee] (Ep. 6)

  Guest Role
• 
  Song Yo Sep

  [MBS TV network department head] (Ep. 6)

  Guest Role
• 
  Jung Jong Hoon

  [KBY TV network department head] (Ep. 6)

  Guest Role
• 
  Han Kyu Hyuk

  Kang Hak Rae (Ep. 6-7)

  Guest Role
• 
  Garrison Michael Farquharson-Keener

  Alan Smith [Referee] (Ep. 6-7)

  Guest Role
• 
  Park Yun

  Jung Da Yeong (Ep. 6-7, 9-11)

  Guest Role
• 
  Jo Min Wook

  Kwon Dung Uk (Ep. 6-7, 9-11)

  Guest Role
• 
  Choi Tae Joon

  Jung Ho Jin [National fencer] (Ep. 6, 12)

  Guest Role
• 
  Ji Yun Seong

  Ji Yun Seong [KBY Reporter] (Ep. 6, 12)

  Guest Role
• 
  Lee Jong Goo

  [Diner] (Ep. 7)

  Guest Role
• 
  Go Dong Eob

  [Diner] (Ep. 7)

  Guest Role
• 
  Choi Hwa Young

  [Diner] (Ep. 7)

  Guest Role
• 
  Bae Yoo Ri

  [Hotel receptionist] (Ep. 7)

  Guest Role
• 
  Bae Hyun Kyung

  [UBS Network Sports department staff] (Ep. 7)

  Guest Role
• 
  Baek Suk Kwang

  Na Sung Jin [Hee Do's father] (Ep. 7, 11)

  Guest Role
• 
  Shin Yeon Suk

  [Hee Do's grandmother] (Ep. 7, 11)

  Guest Role
• 
  Lee Joon Hee

  Ha Byung Jin (Ep. 8)

  Guest Role
• 
  Park Eun Young

  [Neighbourhood woman] (Ep. 8)

  Guest Role
• 
  Yoon Boo Jin

  [Neighbourhood woman] (Ep. 8)

  Guest Role
• 
  Goo Shi Yeon

  [Jae Kyung's co-worker] (Ep. 8)

  Guest Role
• 
  Kwak Myung Hwa

  [Fencing association executive] (Ep. 8)

  Guest Role
• 
  Kim Sung Yong

  [Disciplinary committee member] (Ep. 8)

  Guest Role
• 
  Nam Dong Ha

  [Disciplinary committee member] (Ep. 8)

  Guest Role
• 
  Kim Joon Hyung

  [Sanga University coach] (Ep. 8, 11)

  Guest Role
• 
  Yoo Min Joo

  Park Hye Jin (Ep. 9)

  Guest Role
• 
  Kim In Cheol

  [Cinematographer]

  Guest Role
• 
  Lee Hae Won

  [Bus man] (Ep. 14)

  Guest Role
• 
  Andy Jin

  [Japanese fencing coach]

  Guest Role
• 
  Min Hyeon U

  [Soldier] (Ep. 2)

  Guest Role
• 
  Kim Mi Suk

  [Dog shop owner]

  Guest Role
• 
  Choi Si A

  Baek Soo Yeong (Ep. 11)

  Guest Role
• 
  Yoon Joo Man

  Park [UBS Network Documentary PD] (Ep. 9-10)

  Guest Role
• 
  Lee Shi Hoo

  [UBS Network Cameraman] (Ep. 9-10)

  Guest Role
• 
  Park Ji Ho

  [UBS Network Documentary staff] (Ep. 9-10)

  Guest Role
• 
  Yoon Se Woong

  Seo Yeong Seong [Tae Yang High School teacher] (Ep. 9-12)

  Guest Role
• 
  Oh Choong Geun

  [UBS Network staff] (Ep. 9, 12)

  Guest Role
• 
  Kim Tae Moon

  [UBS Network cameraman] (Ep. 9, 12)

  Guest Role
• 
  Cha Yong Hwan

  Hwang Ho Jin [UBS Network reporter] (Ep. 11)

  Guest Role
• 
  Oh Il Young

  [Carpenter] (Ep. 11)

  Guest Role
• 
  Jun Joon Woo

  [Restaurant host] (Ep. 11)

  Guest Role
• 
  Park Yoo Mil

  [UBS Network staff] (Ep. 11)

  Guest Role
• 
  Jeong Young Do

  [UBS anchor] (Ep. 11-12)

  Guest Role
• 
  Ji Hyun Woo

  [Jungle Prince bassist] (Ep. 11, 13)

  Guest Role
• 
  Kang Seong Hwa

  [Jungle Prince guitarist] (Ep. 11, 13)

  Guest Role
• 
  Im Woo Chan

  [Jungle Prince drummer] (Ep. 11, 13)

  Guest Role
• 
  Kang Sung Jin

  [Jungle Prince keyboardist] (Ep. 11, 13)

  Guest Role
• 
  Shin Hee Chul

  Kim [Detective] (Ep. 12)

  Guest Role
• 
  Jung Hyun Chul

  [Detective] (Ep. 12)

  Guest Role
• 
  Do Ye Chan

  [Policeman] (Ep. 12)

  Guest Role
• 
  Park Chan Young

  [Upset diner] (Ep. 12)

  Guest Role
• 
  Bae Gi Beom

  [Upset diner] (Ep. 12)

  Guest Role
• 
  Baek Ji Hye

  Kim Da Mi (Ep. 13)

  Guest Role
• 
  Lee Sang Kyung

  Yang Chan Mi [Young] (Ep. 13)

  Guest Role
• 
  Kim Mi Hye

  Shin Jae Kyung [Young] (Ep. 13)

  Guest Role
• 
  Kim Jun Ho

  Jun Ho [Hee Do's senior] (Ep. 13)

  Guest Role
• 
  Byun Yoon Jeong

  [Ji Woong's mother] (Ep. 13)

  Guest Role
• 
  Yang Eun Sol

  [Reporter] (Ep. 14)

  Guest Role
• 
  Kim Jang Hwan

  [Reporter] (Ep. 14)

  Guest Role
• 
  So Joon Sung

  [Reporter] (Ep. 14)

  Guest Role
• 
  Na Ho Won

  [Bus driver] (Ep. 14)

  Guest Role
• 
  Choi Min

  [Fencing coach] (Ep. 14)

  Guest Role
• 
  Cha Mi Kyung

  [Victim's mother] (Ep. 14)

  Guest Role
• 
  Son Dong Soo

  [Sports agency employee] (Ep. 14)

  Guest Role
• 
  Choi Nam Uk

  [Fencing association employee] (Ep. 14)

  Guest Role
• 
  Kim Joo Ah

  Sophia Choi [9/11 survivor] (Ep. 15)

  Guest Role
• 
  Park Yong

  [9/11 survivor] (Ep. 15)

  Guest Role
• 
  Lee Sung Il

  [UBS Network staff] (Ep. 15)

  Guest Role
• 
  Ha Seung Yeon

  [Hospital hallway woman] (Ep. 15)

  Guest Role
• 
  Kim Si Kook

  [University teacher assistant] (Ep. 15)

  Guest Role
• 
  Park Ki Duk

  Lee Gi Hun (Ep. 15-16)

  Guest Role
• 
  Kwon Dan A

  [National team fencer] (Ep. 15-16)

  Guest Role
• 
  Park Se In

  Han Min Jung (Ep. 16)

  Guest Role
• 
  Kang Hoon

  Baek Yi Hyun [Older] (Ep. 16)

  Guest Role
• 
  Kang Moon Kyung

  [UBS director 2009] (Ep. 16)

  Guest Role
• 
  Park Bin

  [UBS Network staff ] (Ep. 16)

  Guest Role
• 
  Park Bo Bae

  [UBS Network staff ] (Ep. 16)

  Guest Role
• 
  Kim Nam Hee

  [Cellphone store employee] (Ep. 16)

  Guest Role
• 
  Yang Joon Seok

  [Student]

  Guest Role
• 
  Lee Joon Sun

  [Reporter]

  Guest Role
• 
  Jeon Jeong Il

  [Café boss]

  Guest Role
• 
  Kim Do Gyeong

  [Employee]

  Guest Role
• 
  Lee Song Kyung

  [Tae Yang High School Fencing club member]

  Guest Role
• 
  Park Ha Eun

  [Tae Yang High School Fencing club member]

  Guest Role

Cameo

• 
  Park Hyuk Cameo

Voice Actor

• 
  Jaspreet Kaur

  [Reporter] (Ep. 7)

  Voice Actor

Unknown

• 
  Kim Ha Jin Unknown