Pro Bono

Director

• 
  Kim Seong Yoon

Screenwriter

• 
  Moon Yoo Seok

Main Role

• 
  Jung Kyung Ho

  Kang Da Wit

  Main Role
• 
  So Ju Yeon

  Park Gi Ppeum

  Main Role
• 
  Yoon Na Moo

  Jang Yeong Sil

  Main Role
• 
  Seo Hye Won

  Yoo Nan Hui

  Main Role
• 
  Kang Hyung Suk

  Hwang Jun U

  Main Role

Support Role

• 
  Lee Yoo Young

  O Jeong In [O & Partners attorney]

  Support Role
• 
  Choi Dae Hoon

  Woo Myeong Hun [David’s classmate]

  Support Role
• 
  Lee Moon Shik

  Sin Jeong Suk [Chief Justice of Seoul central district court]

  Support Role
• 
  Sung Dong Il

  Chae Ho Jip [Judge]

  Support Role
• 
  Kim Jung Young

  Kim Seong Rye [David's mother]

  Support Role
• 
  Kim Gab Soo

  O Gyu Jang [Jeong In's father]

  Support Role

Guest Role

• 
  Yeon Je Wook

  Kim Ju Seop

  Guest Role
• 
  Song Young Chang

  Jang Hyeon Bae (Ep. 1)

  Guest Role
• 
  Lee Dal Hyung

  [Chairman] (Ep. 1)

  Guest Role
• 
  Yoon Sang Jung

  Ji So Yeon (Ep. 2)

  Guest Role
• 
  Sung Byung Sook

  Yun Jeong Hui [Dog Cafe owner] (Ep. 2)

  Guest Role
• 
  Yang Jae Sung

  Baek Jung Seop [Jeong Hui's husband] (Ep. 2)

  Guest Role
• 
  Shin Hye Ji

  Baek Han Byeol (Ep. 2)

  Guest Role
• 
  Lee Hyun Kyun

  O Jae Seop [Judge] (Ep. 2, 10)

  Guest Role
• 
  Choi Hee Jin

  Kim Jin O [Judge] (Ep. 3)

  Guest Role
• 
  Park Cheol Min

  Park Cheol Min [Chairman of the Health Insurance Commission] (Ep. 3)

  Guest Role
• 
  Lee Cheon Mu

  Kim Gang Hun (Ep. 3-4)

  Guest Role
• 
  Jeong Yu Jin

  Jung So Min [Gang Hun's mother] (Ep. 3-4)

  Guest Role
• 
  Lee Dae Yeon

  Kook Yeong Jun [Judge] (Ep. 3-4)

  Guest Role
• 
  Kwon Dan Ah

  Jung So Min [Child] (Ep. 4)

  Guest Role
• 
  Yoo Jae Myung

  Choi Ung San [Chairman of Woongsan Group] (Ep. 4)

  Guest Role
• 
  Moon Su A

  [So Min's mother] (Ep. 4)

  Guest Role
• 
  Baek Hyeon Ju

  [Sword dancing instructor] (Ep. 4)

  Guest Role
• 
  Sung Yeo Jin

  Koo Ji Won [Judge] (Ep. 5)

  Guest Role
• 
  Yoon Seok Hyun

  [Dong Min's lawyer] (Ep. 5)

  Guest Role
• 
  Park Joo Yong

  [Dong Min's friend] (Ep. 5)

  Guest Role
• 
  Jang Nam Yul

  [Village chief] (Ep. 5)

  Guest Role
• 
  Lee Sang Goo

  [Pharmacist] (Ep. 5)

  Guest Role
• 
  Kang Jung Im

  [Yangchon resident] (Ep. 5)

  Guest Role
• 
  Go Byung Taek

  [Yangchon resident] (Ep. 5)

  Guest Role
• 
  Lee Young Shil

  [Yangchon resident] (Ep. 5)

  Guest Role
• 
  Lee Suk Koo

  [Yangchon resident] (Ep. 5)

  Guest Role
• 
  Tae Hang Ho

  Cho Dong Min [Kaya's husband] (Ep. 5-6)

  Guest Role
• 
  Park Yoon Hee

  Cho Byeon Hak (Ep. 5-6)

  Guest Role
• 
  Jung Hoe Rin

  Kaya (Ep. 5-6)

  Guest Role
• 
  Yun Jin Seong

  [Byeon Hak's wife] (Ep. 5-6)

  Guest Role
• 
  Lee Won Jong

  Cho Gang Yeol [Judge] (Ep. 6)

  Guest Role
• 
  Ahn Hee Joo

  [Migrant center staff] (Ep. 6)

  Guest Role
• 
  Jung Myung Joon

  [Government official] (Ep. 6)

  Guest Role
• 
  Kim Ga Ran

  Secretary Seo (Ep. 7)

  Guest Role
• 
  Jun Joon Woo

  [Employee] (Ep. 7)

  Guest Role
• 
  Park Hee Jung

  [Employee] (Ep. 7)

  Guest Role
• 
  Park Sang Hyuk

  [Judge] (Ep. 7)

  Guest Role
• 
  Park Woo Bin

  [Nurse] (Ep. 7)

  Guest Role
• 
  Jung Ji So

  Elijah [K-pop idol] Ep. 7-8)

  Guest Role
• 
  Oh Min Ae

  Cha Jin Hui (Ep. 7-8)

  Guest Role
• 
  Yang Joon Myung

  Kim Ju Won (Ep. 7-8)

  Guest Role
• 
  Oh So Hyun

  [Stylist] (Ep. 7-8)

  Guest Role
• 
  Jung Yeon

  Ma Yeong Suk (Ep. 7-8)

  Guest Role
• 
  Baek Seung Yeon

  Song Ji Hye (Ep. 7-8)

  Guest Role
• 
  Jang Deok Su

  Kang Min Ha (Ep. 8)

  Guest Role
• 
  Jo Han Chul

  Lawyer Kim (Ep. 9)

  Guest Role
• 
  Kim Yong Jun

  Yoo Baek Man (Ep. 9-10)

  Guest Role
• 
  Kim Chul Ki

  Choi Dong Geun [Lawyer/former investigative prosecutor] (Ep. 10)

  Guest Role
• 
  Yoon Bok In

  Lee Yun Hui (Ep. 11)

  Guest Role
• 
  Park Sung Geun

  Kim Seong Hun [Senior judge] (Ep. 12)

  Guest Role
• 
  Kim Byung Gi

  [Public rental housing defendant] (Ep. 12)

  Guest Role
• 
  Chae Seo An

  Yoo I Na

  Guest Role
• 
  Lim Young Joon

  Bae Jeong Hwan

  Guest Role
• 
  Park Yoon Ho

  Kang David [Teen]

  Guest Role
• 
  Choi Jae Yoon

  Kang David [Child]

  Guest Role
• 
  Lee Kang Wook

  Kim Do Hun | Koo Ji Hwan

  Guest Role
• 
  Ji So Young

  Reporter Park

  Guest Role
• 
  Kim Jae Man

  Cha Guk Jin

  Guest Role
• 
  Go Han Min

  Bae Yong Hun

  Guest Role
• 
  Kim Tae Yeon

  Park Gi Ppeum [Child]

  Guest Role
• 
  Shin Chae Rin

  A Reum

  Guest Role
• 
  Lee Nam Hee

  Lawyer Park

  Guest Role
• 
  Kang Hye Rin

  Lee Se Ryeong

  Guest Role
• 
  Woo Sang Wook

  Han Seung Heon

  Guest Role
• 
  Shin Dong Ryuk

  Cho Yeong Rae

  Guest Role
• 
  Min Eung Shik

  Choi Yeong Seop

  Guest Role
• 
  Kang Jung Goo

  Lawyer Jeong

  Guest Role
• 
  Kim Bo Mi

  Baek Seung [Lawyer]

  Guest Role
• 
  Jang Yong Chul

  [Hyeon Bae's lawyer]

  Guest Role
• 
  Han Ki Jang

  [Aide]

  Guest Role
• 
  Jang Yoon Woo

  [Judge]

  Guest Role
• 
  Kim Si Hyeon

  [Audience]

  Guest Role
• 
  Kim Yi Yeong

  [Court witness]

  Guest Role
• 
  Yu In

  [Child's mother]

  Guest Role
• 
  Yu Seung Il

  [Criminal senior chief judge]

  Guest Role
• 
  Park Yong

  [Civil senior chief judge]

  Guest Role
• 
  Kang Han Saem

  [Electronics repairman]

  Guest Role
• 
  Lee Na Ri

  [Oh & Partner's staff]

  Guest Role
• 
  Bang Min Sun

  [Oh & Partner's lawyer]

  Guest Role
• 
  Oh Yeon Jae

  [Maid]

  Guest Role
• 
  Yang Jin Seon

  [Trial spectator]

  Guest Role
• 
  Kim Kwon

  [Judge]

  Guest Role
• 
  Kang Ji Yong

  [Student]

  Guest Role
• 
  Yang Mi Seon

  [Special education school protestor]

  Guest Role
• 
  Lee Hyun Seo

  [OB/GYN]

  Guest Role
• 
  Ahn Soo Bin

  [Teacher]

  Guest Role
• 
  Shin Yong Jin

  [Woongsan executive]

  Guest Role
• 
  Jo Hyun Jin

  [Appellate judge]

  Guest Role
• 
  Jung Hyung Suk

  [Criminal judge]

  Guest Role
• 
  Lee Ki Sub

  [Government official]

  Guest Role
• 
  Kim Joon Hyung

  [Lawyer]

  Guest Role