Snowdrop

Composer

• 
  Kim Tae Seong

Director

• 
  Jo Hyun Tak

Screenwriter

• 
  Yoo Hyun Mi

Main Role

• 
  Jung Hae In

  Im Su Ho / Rim Tae San

  Main Role
• 
  Ji Soo

  Eun Yeong Ro

  Main Role
• 
  Jang Seung Jo

  Lee Gang Mu

  Main Role
• 
  Yoo In Na

  Kang Cheong Ya / Kim Eun Hye

  Main Role
• 
  Yoon Se Ah

  Pi Seung Hui

  Main Role
• 
  Kim Hye Yoon

  Kye Bun Ok

  Main Role
• 
  Jung Eugene

  Jang Han Na

  Main Role

Support Role

• 
  Huh Joon Ho

  Eun Chang Su

  Support Role
• 
  Park Sung Woong

  Nam Tae Il

  Support Role
• 
  Lee Hwa Ryong

  An Gyeong Hui

  Support Role
• 
  Kim Jung Nan

  Hong Ae Ra [Yeong Ro's step-mother]

  Support Role
• 
  Jung Hye Young

  Cho Seong Sim [Tae Il's wife]

  Support Role
• 
  Baek Ji Won

  Choi Mi Hye [Gyeong Hui's wife]

  Support Role
• 
  Jung Shin Hye

  Ko Hye Ryeong

  Support Role
• 
  Kim Mi Soo

  Yeo Jeong Min

  Support Role
• 
  Choi Hee Jin

  Yun Seol Hui

  Support Role
• 
  Jeong E Suh

  Sin Gyeong Ja [Student president of the Women's University]

  Support Role
• 
  Kim Min Gue

  Ju Gyeok Chan

  Support Role
• 
  Jang In Sub

  Lee Eung Cheol

  Support Role
• 
  Kim Jong Soo

  Kim Man Dong

  Support Role
• 
  Nam Mi Jung

  O Deok Sim

  Support Role
• 
  Jeon Moo Song

  Lim Ji Rok [Deputy director of United Front Department]

  Support Role
• 
  Jung Ae Ri

  Choi Su Ryun [Deputy chief of the National Security Agency]

  Support Role
• 
  Heo Nam Jun

  O Gwang Tae [Su Ho's friend]

  Support Role
• 
  Ahn Dong Goo

  Choi Byeong Tae [Korea Military Academy cadet]

  Support Role
• 
  Kim Jung Hoon

  Kim Sang Beom [Man Dong's son]

  Support Role
• 
  Choi Kyung Hoon

  O Dong Jae [ANSP member]

  Support Role
• 
  Moon You Kang

  Seung Jun [ANSP member]

  Support Role
• 
  Kang Moon Kyung

  Park Mu Yeol

  Support Role
• 
  Kim Jung Ho

  Han I Seop [Professor ]

  Support Role
• 
  Jang Tae Min

  [Chang Su's secretary]

  Support Role
• 
  Park Ye Ni

  Kim Ye Ni [Secretary Kim of Charmant]

  Support Role
• 
  Lee Seung Jin

  [South Korean Military agent]

  Support Role
• 
  Choi Yoon Je

  [ANSP member]

  Support Role
• 
  Jeon Jeong Il

  [Childlike society member]

  Support Role

Guest Role

• 
  Heo Yeong Son

  [Boarder] (Ep. 1)

  Guest Role
• 
  Lee Jung Hyun

  Park Geum Cheol [Su Ho's colleague] (Ep. 1-2, 12)

  Guest Role
• 
  Jung Hee Young

  Ms. Bong (Ep. 1, 3)

  Guest Role
• 
  Chae Won Bin

  Im Su Hui [Su Ho's sister] (Ep. 2, 11)

  Guest Role
• 
  Yeom Jung Ah

  Song Hui Ju [Former headmistress] (Ep. 2-3, 8, 16)

  Guest Role
• 
  Song Geon Hee

  Eun Yeong U [Yeong Ro's brother] (Ep. 2, 5-6, 8)

  Guest Role
• 
  Kwon Han Sol

  [Photographer] ( Ep. 3)

  Guest Role
• 
  Eom Ok Ran

  [Chang Su's maid] (Ep. 3, 6, 11)

  Guest Role
• 
  Park Seon Ok

  [Loan shark boss] (Ep. 4)

  Guest Role
• 
  Seon Yul U

  [Loan shark employee] (Ep. 4)

  Guest Role
• 
  Tak I On

  [Agent] (Ep. 4-5)

  Guest Role
• 
  Bae Myung Jin

  [North Korean agent] (Ep. 4-5)

  Guest Role
• 
  Song Hoon

  [Chang Su's driver] (Ep. 5)

  Guest Role
• 
  Yoo Sung Joo

  [North Korean military commander] (Ep. 5)

  Guest Role
• 
  Seo Suk Gyu

  [South Korean Special Forces member] (Ep. 5)

  Guest Role
• 
  Seo Myung Chan

  Kim Hyeon Seung [Priest] (Ep. 7)

  Guest Role
• 
  Han Ji Wan

  [Sniper] (Ep. 7)

  Guest Role
• 
  Baek Ji Yeon

  Yeom Ji Hye [News reporter] (Ep. 7-8)

  Guest Role
• 
  Lee So E

  [Hostage] (Ep. 9)

  Guest Role
• 
  Lee Joo Ahn

  Jun Pyo [President's son] (Ep. 10)

  Guest Role
• 
  Kim Ha Jin

  Yang Chun Sim (Ep. 10-11)

  Guest Role
• 
  Jo Yeon Ho

  Im Su Ho [Young] (Ep. 10, 15)

  Guest Role
• 
  Ariane Desgagnes-Leclerc

  Linda Yeong / Kong Gil Sun (Ep. 13-14)

  Guest Role
• 
  Lee Yoon Sang

  [Assemblyman] (Ep. 16)

  Guest Role
• 
  Shin Sa Rang

  Yeon Hwa

  Guest Role
• 
  Park Hyo Bin

  Park Sun Ja [Student]

  Guest Role
• 
  Lee Jin Seung

  Yoo Yeong Jun [Media]

  Guest Role
• 
  Han Myung Chul

  [Seol Hui's father]

  Guest Role
• 
  Kim Bong Man

  [Tae Il's secretary]

  Guest Role
• 
  Hwang Soo Min

  [JBC anchor]

  Guest Role
• 
  Jang Yoon Woo

  [JBC reporter]

  Guest Role
• 
  Shin An Jin

  [Fortune teller]

  Guest Role
• 
  Park Sang Jong

  [Electronics repairman]

  Guest Role
• 
  Lee Do Hye

  [Hosu University student]

  Guest Role
• 
  Kim Eun Seo

  [Hosu University student]

  Guest Role
• 
  Jang Hye Won

  [Hosu University student]

  Guest Role
• 
  Yim So Yun

  [Student]

  Guest Role
• 
  Joo Ha Yeon

  [Student]

  Guest Role
• 
  Choi Hyun Young

  [Student]

  Guest Role
• 
  Park Soo Ryun

  [College student]

  Guest Role
• 
  Kim Ju Heon

  [NIS agent]

  Guest Role
• 
  Cha Seo Hyun Guest Role

Unknown

• 
  Kim Seo Hyun Unknown
• 
  Ji Ui Jung Unknown
• 
  Gong Do Eun Unknown
• 
  Kim Seung Hwa Unknown
• 
  Kang Tae Je Unknown
• 
  Pyun Hae Joon Unknown