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 [Da Wit’s classmate]

  Support Role
• 
  Lee Moon Sik

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

  Support Role
• 
  Kim Jung Young

  Kim Seong Rye [Da Wit's mother]

  Support Role
• 
  Kim Gab Soo

  O Gyu Jang [Jeong In's father]

  Support Role

Guest Role

• 
  Lim Young Joon

  Bae Jeong Hwan (Ep. 1)

  Guest Role
• 
  Jang Yong Chul

  [Hyeon Bae's lawyer] (Ep. 1)

  Guest Role
• 
  Yu Seung Il

  [Criminal senior chief judge] (Ep. 1)

  Guest Role
• 
  Park Yong

  [Civil senior chief judge] (Ep. 1)

  Guest Role
• 
  Choi Jae Yoon

  Kang Da Wit [Child] (Ep. 1-2)

  Guest Role
• 
  Chae Seo An

  Yoo I Na (Ep. 1, 3)

  Guest Role
• 
  Kang Han Saem

  Ji Dong Cheol [Electronics repairman] (Ep. 1, 3-4, 9, 11)

  Guest Role
• 
  Yeon Je Wook

  Yoo Jae Beom | Kim Ju Seop (Ep. 1-3, 8-12)

  Guest Role
• 
  Lee Kang Wook

  Kim Do Hun [Reporter] | Koo Ji Hwan [Attorney] (Ep. 1, 4, 6-9, 11-12)

  Guest Role
• 
  Ji So Young

  Reporter Park (Ep. 1, 4, 6, 8-9, 11-12)

  Guest Role
• 
  Lee Dal Hyung

  Mr. Lee [Court union chairman] (Ep. 1, 5)

  Guest Role
• 
  Park Yoon Ho

  Kang Da Wit [Teen] (Ep. 1, 5, 9)

  Guest Role
• 
  Song Young Chang

  Jang Hyeon Bae (Ep. 1, 11-12)

  Guest Role
• 
  Shin Chae Rin

  A Reum (Ep. 2)

  Guest Role
• 
  Lee Nam Hee

  Lawyer Park (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
• 
  Oh Yeon Jae

  Mrs. Kim [Maid] (Ep. 2)

  Guest Role
• 
  Sung Dong Il

  Chae Ho Jip [Judge] (Ep. 2)

  Guest Role
• 
  Byeon Chang Yeol

  [Fake witness] (Ep. 2)

  Guest Role
• 
  Yoon Sang Jung

  Ji So Yeon (Ep. 2-3)

  Guest Role
• 
  Seong Byung Sook

  Yun Jeong Hui [Dog Cafe owner] (Ep. 2-3)

  Guest Role
• 
  Kim Jae Man

  Cha Guk Jin [O & Partners lawyer] (Ep. 2, 5, 9)

  Guest Role
• 
  Lee Hyun Kyun

  O Jae Seop [Judge] (Ep. 2, 10-11)

  Guest Role
• 
  Choi Hee Jin

  Kim Jin O [Judge] (Ep. 3)

  Guest Role
• 
  Kim Tae Yeon

  Park Gi Ppeum [Child] (Ep. 3)

  Guest Role
• 
  Park Chul Min

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

  Guest Role
• 
  Jin Tae Yeon

  [Professor] (Ep. 3)

  Guest Role
• 
  Ma Jung Pil

  [Interviewer] (Ep. 3)

  Guest Role
• 
  Lee Cheon Mu

  Kim Gang Hun (Ep. 3-4)

  Guest Role
• 
  Yoo Chea Myung

  Choi Ung San [Chairman of Woongsan Group] (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
• 
  Shin Yong Jin

  [Woongsan executive] (Ep. 3-4)

  Guest Role
• 
  Kim Joon Hyung

  [O & Partners lawyer] (Ep. 3-4)

  Guest Role
• 
  Bang Min Sun

  [O & Partners lawyer] (Ep. 3-4)

  Guest Role
• 
  Go Han Min

  Bae Yong Hun [O & Partners lawyer] (Ep. 3-5, 7, 9-11)

  Guest Role
• 
  Bang Joong Hyun

  Park Chang Sun [Gi Ppeum's father] (Ep. 3, 5, 8, 12)

  Guest Role
• 
  Choi Bo Kwang

  Yoo In Sil [Gi Ppeum's mother] (Ep. 3, 8-10, 12)

  Guest Role
• 
  Kang Hye Rin

  Lee Se Ryeong (Ep. 4)

  Guest Role
• 
  Yu In

  [Student's mother] (Ep. 4)

  Guest Role
• 
  Kwon Dan Ah

  Jung So Min [Child] (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
• 
  Ahn Soo Bin

  [Teacher] (Ep. 4)

  Guest Role
• 
  Kang Ji Yong

  [Student] (Ep. 4)

  Guest Role
• 
  Yang Mi Seon

  [Special education school protestor] (Ep. 4)

  Guest Role
• 
  Lee Sang Goo

  [Pharmacist] (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
• 
  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
• 
  Jung Hoe Rin

  Kaya (Ep. 5-6)

  Guest Role
• 
  Jang Nam Yul

  Mr. Chan [Village chief] (Ep. 5-6)

  Guest Role
• 
  Park Yoon Hee

  Cho Byeon Hak (Ep. 5-6)

  Guest Role
• 
  Sung Yeo Jin

  Koo Ji Won [Judge] (Ep. 5-6)

  Guest Role
• 
  Tae Hang Ho

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

  Guest Role
• 
  Park Hye Young

  Jung Ui Hyeon [High Court judge] (Ep. 5-6)

  Guest Role
• 
  Yun Jin Seong

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

  Guest Role
• 
  Kim Tae Yeon

  Kaya [Teen] (Ep. 6)

  Guest Role
• 
  Kang Jung Goo

  Lawyer Jung (Ep. 6)

  Guest Role
• 
  Lee Won Jong

  Cho Gang Yeol [Judge] (Ep. 6)

  Guest Role
• 
  Shin Dong Ryuk

  Cho Yeong Rae [Attorney] (Ep. 6)

  Guest Role
• 
  Woo Sang Wook

  Han Seung Heon [Attorney] (Ep. 6)

  Guest Role
• 
  Jo Hyun Jin

  [Appellate judge] (Ep. 6)

  Guest Role
• 
  Jung Hyung Suk

  [Criminal judge] (Ep. 6)

  Guest Role
• 
  Lee Na Ri

  [O & Partners staff] (Ep. 6)

  Guest Role
• 
  Ahn Hee Joo

  [Migrant center staff] (Ep. 6)

  Guest Role
• 
  Kim Yi Yeong

  [Court witness] (Ep. 6)

  Guest Role
• 
  Kim Si Hyeon

  [Court witness] (Ep. 6)

  Guest Role
• 
  Jung Myung Joon

  [Government official] (Ep. 6)

  Guest Role
• 
  Lee Ki Sub

  [Government official] (Ep. 6)

  Guest Role
• 
  Park Sang Hyuk

  [Judge] (Ep. 7)

  Guest Role
• 
  Park Woo Bin

  [Nurse] (Ep. 7)

  Guest Role
• 
  Jun Joon Woo

  [Lawyer of Baekseung Law Firm] (Ep. 7)

  Guest Role
• 
  Park Hee Jung

  [Lawyer of Baekseung Law Firm] (Ep. 7)

  Guest Role
• 
  Oh Min Ae

  Cha Jin Hui (Ep. 7-8)

  Guest Role
• 
  Baek Seung Yeon

  Song Ji Hye (Ep. 7-8)

  Guest Role
• 
  Yang Joon Myung

  Kim Ju Won (Ep. 7-8)

  Guest Role
• 
  Jung Yeon

  Ma Yeong Suk (Ep. 7-8)

  Guest Role
• 
  Jung Ji So

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

  Guest Role
• 
  Oh So Hyun

  [Stylist] (Ep. 7-8)

  Guest Role
• 
  Kim Ga Ran

  Secretary Seo (Ep. 7, 12)

  Guest Role
• 
  Jang Se Hyuk

  Kang Min Ha (Ep. 8)

  Guest Role
• 
  Song Won Su

  [Victim] (Ep. 8)

  Guest Role
• 
  Lee Yoon Sang

  [Constitution court judge] (Ep. 8)

  Guest Role
• 
  Park Hoo

  Jang Yeong Sil [Teen] (Ep. 8, 11)

  Guest Role
• 
  Kim Bo Mi

  [Lawyer of Baekseung Law Firm] (Ep. 8, 11)

  Guest Role
• 
  Jo Han Chul

  Lawyer Kim (Ep. 9)

  Guest Role
• 
  Kim Yong Jun

  Yoo Baek Man (Ep. 9-11)

  Guest Role
• 
  Baek Seung Chul

  [Ungcheon paper mill manager] (Ep. 9-11)

  Guest Role
• 
  Kim Kwon

  Kong Seok Ho [Judge] (Ep. 10)

  Guest Role
• 
  Kim Ra Hui

  O Jeong In [Child] (Ep. 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
• 
  Seo Sang Won

  Kim Ho Jin [O & Partners advisor] (Ep. 12)

  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
• 
  Min Eung Shik

  Choi Yeong Seop

  Guest Role
• 
  Han Ki Jang

  [Aide]

  Guest Role
• 
  Jang Yoon Woo

  [Judge]

  Guest Role
• 
  Lee Hyun Seo

  [OB/GYN]

  Guest Role
• 
  Yang Jin Seon

  [Trial spectator]

  Guest Role