The Korean action dramaMercy for Nonereleased on Netflix on July 08, 2025, and already the violent revenge narrative has stolen the attention of audiences and critics alike.Mercy for Nonefollows the story of Nam Gi-joon (So Ji-seob) - a former gangster and enforcer in the Seoul criminal underground. When Nam Gi-joon’s brother, Nam Gi-seok, is murdered after insulting the heir to one of the most powerful gangs in Seoul, Nam Gi-joon returns from exile armed with a baseball bat to exact his revenge on everyone involved with his brother’s murder.
Based on the webtoonPlaza Wars: Mercy for Noneby O Se-hyung, all seven episodes of the show are packed with intense drama and nail-biting action. But what elevatesMercy for None,even among otherbingeable K-dramas, is its absolutely star-studded cast.Most of the actors inMercy for Nonehave decades of experience in Korean television and cinema.With all theincredible Korean dramas available on Netflix,Mercy for Nonestill manages to stand out with its gripping narrative about loyalty and revenge.
So Ji-seob as Nam Gi-joon
Born June 04, 2025
Actor:So Ji-seob was born in Seoul, South Korea, and broke into the world of Korean television with the 2001 showLaw Firm. He won a Star Asia Rising Star Award in 2009 after his role asLee Kang-Pae inRough Cut.So Ji-seob uses his fluency in Korean, English, and Japanese to connect with an international audience.
2004
2008
Cain and Abel
2009
Kim Woo Hyun
2012
Character:So Ji-seob plays Nam Gi-joon inMercy for None, the former top enforcer of Seoul’s underworld who retired eleven years before the show began. However, he is pulled back into that life after his brother’s brutal murder.
Huh Joon-ho As Lee Joo-woon
Born June 10, 2025
Actor:Born in Seoul, South Korea, Huh Joon-ho is a pillar of the Korean film and television industry. After starting as a theatrical actor,he broke into the world of film and television in 2003 with the showSilmido, for which he won Best Supporting Actor at the Grand Bell Awards.
2003
2017
2020
Rim Yong-su
2021
Character:InMercy for None, Huh Joon-ho plays Lee Joo-woon. Joo-woon is the head of the Joowoon Group in Seoul, one of the top gangs in the city. His position of extreme power stands in direct contrast to Nam Gi-joon, who single-mindedly pursues vengeance alone.
Ahn Kil-kang as Goo Bong-san
Born July 29, 2025
Actor:Ahn Kil-kang was born in Seoul, South Korea. Although he has been a staple of Korean cinema for decades, his first lead role in Korean television came in the2008 TV series,Il Ji Mae, where Kil-kang played Kongkal Ah Je.
2002
2006
Kongkal Ah Je
Character:Ahn Kil-kang plays Goo Bong-san in Mercy for None. Goo Bong-san is the leader of the Bongsan Group in Seoul, the primary rival gang to Lee Joo-woon’s Joowoon Group.
Lee Boem-Su as Sim Seong-won
Born July 04, 2025
Actor:Also known as “Tiger Lee,” Lee Beom-su was born in Chungju, South Korea. After several years of relatively minor roles in Korean movies and television, Boem-su gained recognition and notoriety after portrayingPil-ho in the 2006 movie,The City of Violence.
2010
Lim Gye-jin
2016
Character:Lee Beom-su plays Sim Seong-won inMercy for None, the CEO of a highly specialized cleaning company. Seong-won’s company, NClean, specializes in cleaning up after murders. In a series as bloody asMercy for None, NClean’s services are essential.
Gong Myoung As Joon-mo
Born June 29, 2025
Actor:Gong Myoung is the stage name of Kim Dong Hyeon, who was born in Gyeonggi-do, South Korea.Myoung entered the spotlight in 2013 as a member of the Kpop and acting group 5urprise, which he was a member of until the group disbanded in 2020.
2019
Kim Ram-Woo
2025
Character:InMercy for None, Gong Myoung plays Joon-mo, the son of Goo Bong-san. At the start of the show, Joon-mo is the managing director of the Bongsan Group. However, everyone expects him to take over from his father, Goo Bong-san, eventually.
Cha Seung-won as Mr. Kim
Born July 06, 2025
Actor:Cha Seung-won was born in Anyang, South Korea. Seung-won appeared in numerous small roles in Korean movies and television in the early 2000s, but he got his first leading role in the2003 series,Bodyguard.
2007
2011
2015
Director Ma
Character:Cha Seung-won plays Mr. Kim inMercy for None. Mr. Kim is the moniker that Cha Yeong-do uses when working as a manager for the Bongsan Group. In his more legitimate life, however, Cha Yeong-do is the head of the Seoul police department’s planning and budgeting department.
Mercy For None Supporting Cast & Characters
Choo Young-woo as Lee Geum-son:Choo Young-woo plays Lee Geum-son, a prosecutor for Seoul’s central district, inMercy for None. Choo Young-woo is best known for his roles in Korean dramas likeOasis(2023) andOnce Upon a Small Town(2022).
Lee Jun-hyuck as Nam Gi-seok:Lee Jun-hyuck plays Nam Gi-jun’s brother, Nam Gi-seok. It is the violent murder of Nam Gi-seok that serves as the inciting incident forMercy for None. Lee Jun hyuck is best known for playing Seo Dong-jae in the TV seriesStrangerfrom 2017 to 2020.
Cho Han-cheul as Choi Sung-cheol:Cho Han-cheol plays Choi Sung-cheol inMercy for None, Lee Ju-woon’s right-hand man and a director of the Juwoon Group. Cho Han-cheul is best known for playing a king in the 2018 Korean historical drama,100 Days My Prince.
Mercy for None
Cast
Mercy for None follows a former gangster who, after distancing himself from his past, returns to investigate his brother’s death. Driven by a desire for truth, he navigates a dangerous path of retribution, confronting old enemies and uncovering hidden secrets. Released in 2025, the series engages themes of loyalty and vengeance.
