W

Composer

• 
  Copykumo
• 
  Jung Se Rin

Director

• 
  Jeong Dae Yun
• 
  Park Seung Woo

Martial Arts Director

• 
  Baek Kyung Chan

Screenwriter

• 
  Song Jae Jung

Main Role

• 
  Lee Jong Suk

  Kang Chul

  Main Role
• 
  Han Hyo Joo

  O Yeon Ju

  Main Role

Support Role

• 
  Kim Eui Sung

  O Seong Mu [Yeon Ju's father]

  Support Role
• 
  Lee Tae Hwan

  Seo Do Yun [Kang Cheol's bodyguard]

  Support Role
• 
  Jung Eugene

  Yun Su Hui [Kang Cheol's secretary]

  Support Role
• 
  Lee Si Eon

  Park Su Bong [Seong Mu's subordinate]

  Support Role
• 
  Kang Ki Young

  Kang Seok Beom [Yeon Ju's co-worker]

  Support Role
• 
  Heo Jung Do

  Park Min Su [Yeon Ju's boss]

  Support Role
• 
  Park Won Sang

  Han Cheol Ho [Prosecutor / Kang Cheol's rival]

  Support Role
• 
  Cha Kwang Soo

  Son Hyeon Seok [Kang Cheol's boss]

  Support Role
• 
  Lee Se Rang

  Kil Su Yeong [Yeon Ju's aunt]

  Support Role
• 
  Nam Gi Ae

  Kil Su Seon [Yeon Ju's mother]

  Support Role
• 
  Ryu Hye Rin

  Seon Mi [Seong Mu's subordinate]

  Support Role
• 
  Park Sung Taek

  Detective Park

  Support Role
• 
  Yang Hye Ji

  Yun Hui [Seong Mu's subordinate]

  Support Role
• 
  Lee Chae Kyung

  Nurse Jung

  Support Role

Guest Role

• 
  Park Choong Seon

  Kang Yun [Kang Cheol's father] (Ep. 1)

  Guest Role
• 
  Kim Na Woon

  Yun Mi Ho [Kang Cheol's mother] (Ep. 1)

  Guest Role
• 
  Choi Min Yeong

  Jun Seok [Kang Cheol's younger brother] (Ep. 1)

  Guest Role
• 
  Seo Shin Ae

  Kang Su Yeon [Kang Cheol's younger sister] (Ep. 1)

  Guest Role
• 
  Kim Ji Eun

  [Girl at bus stop] (Ep. 3)

  Guest Role
• 
  Ahn Se Ha

  Kim Pung Ho [Yeon Ju's blind date] (Ep. 6)

  Guest Role
• 
  Hwang Seok Jeong

  [Webtoon writer] (Ep. 6)

  Guest Role
• 
  Oh Hee Joon

  [Motel receptionist] (Ep. 16)

  Guest Role
• 
  Ri Min

  Team Leader Park

  Guest Role
• 
  Jung Ji So

  O Yeon Ju [Young]

  Guest Role
• 
  Park Min Ha

  O Yeon Ju [Young]

  Guest Role
• 
  Noh Haeng Ha

  Kim Yu Ri [Yeon Ju's ancestor]

  Guest Role
• 
  Kang Pil Sun

  [Doctor]

  Guest Role
• 
  Kim Mi Hye

  [Reporter]

  Guest Role
• 
  Jin Hyun Kwang

  [Police officer]

  Guest Role
• 
  Kim Ik Tae

  [Lawmaker]

  Guest Role
• 
  Kim Deuk Gyum

  [Hotel waiter]

  Guest Role
• 
  Song Jae Ryong

  [Game speaker]

  Guest Role
• 
  Park Se Hoon

  [Psychiatric hospital nurse]

  Guest Role
• 
  Park Sook Myung

  [Market clothing store owner]

  Guest Role
• 
  Park Won Ho Guest Role
• 
  Sul Ji Yoon Guest Role

Unknown

• 
  Seo Kwang Jae Unknown
• 
  Dong Yoon Seok Unknown
• 
  Kim Jae Il Unknown
• 
  Park Geon Rak Unknown
• 
  Yeo Woon Bok Unknown
• 
  Nam Jin Bok Unknown
• 
  Min Joon Ho Unknown
• 
  Kim Kwang Hyun Unknown
• 
  Seo Jin Wook Unknown
• 
  Lim Jae Min Unknown
• 
  Son Min Woo Unknown
• 
  Yang Seung Geol Unknown
• 
  Choi Young Unknown
• 
  Kim Joo Young Unknown