In a world where loyalty is fleeting and betrayal lurks in every shadow, Mercy for None plunges deep into the brutal reality of gang warfare. As former enforcer Nam Gi-jun returns to the underworld seeking revenge for his brother’s death, he finds himself entangled in a deadly battle for power. With shifting alliances and relentless bloodshed, survival means knowing who to trust—before it’s too late.
Mercy for None Information
| Category | Mercy for None |
|---|---|
| Native title | 광장 |
| Country | South Korea |
| Genre | Action, Crime, Noir |
| Director by | Choi Sung-eun |
| Story by | Yoo Kisung |
| Starring Cast | So Ji-sub as Nam Ki-joon Heo Jun-ho and Ahn Gil-kang Lee Beom-soo Gong Myung Choo Young-woo Jo Han-chul Cha Seung-won, and Lee Jun-hyuk |
| Number of Episodes | 8 |
| Release dates | Scheduled for April 2025 |
| Streaming by | NETLFIX |
Mercy for None Cast
So Ji-sub as Nam Ki-joon
A former key member of the Bongsan Clan, Nam Gi-jun left the criminal underworld to live a quiet life. However, when his younger brother is killed in a gang war, he is drawn back into the violent world he tried to escape. Determined to avenge his brother, he becomes entangled in a ruthless power struggle.
So Ji-sub
◾Birth Date: November 4, 1977
◾Birthplace: Seoul, South Korea
◾Debut Work: Model (1995)
◾Notable Works: I’m Sorry, I Love You (2004), Cain and Abel (2009), Master’s Sun (2013), Oh My Venus (2015), Doctor Lawyer (2022)
◾Social Media: Instagram
Heo Joon-ho as Lee Joo-woon
The powerful leader of the Joo-woon Clan, Lee Joo-woon is a calculating and merciless crime boss. He was responsible for recruiting Nam Gi-seok, Gi-jun’s younger brother, into his organization. As tensions rise, he faces off against Gi-jun in a deadly game of loyalty and betrayal.
Heo Jun-ho
◾Birth Date: April 14, 1964
◾Birthplace: Seoul, South Korea
◾Debut Work: The Moon of Seoul (1994)
◾Notable Works: The Divine Weapon (2008), The Emperor: Owner of the Mask (2017), Kingdom (2019), Snowdrop (2021)
◾Social Media: Not publicly available
Ahn Gil-kang as Gu Bong-san
The head of the Bongsan Clan, Gu Bong-san once saw Nam Gi-jun as a valuable asset. With the return of his former right-hand man, he must decide whether to support Gi-jun’s vendetta or treat him as a threat to his own power.
Ahn Gil-kang
◾Birth Date: August 24, 1966
◾Birthplace: Gangwon Province, South Korea
◾Debut Work: Green Fish (1997)
◾Notable Works: The Divine Weapon (2008), The Great Merchant (2010), The Tale of the Nine-Tailed (2020)
◾Social Media: Not publicly available
Lee Beom-soo as Sim Seong-won
A veteran figure in the underworld, Sim Seong-won is a strategist who navigates the shifting alliances and betrayals between rival gangs. He has survived long enough to understand that true power lies not just in force, but in manipulation.
Lee Beom-soo
◾Birth Date: January 3, 1970
◾Birthplace: Cheongju, South Korea
◾Debut Work: The Ginkgo Bed (1996)
◾Notable Works: Giant (2010), History of a Salaryman (2012), The Prime Minister and I (2013)
◾Social Media: Not publicly available
Gong Myung as Gu Jun-mo
The son of Gu Bong-san, Gu Jun-mo is an ambitious but reckless young gangster trying to prove himself. His actions often escalate conflicts between the Bongsan and Joo-woon Clans, making him both a dangerous pawn and a wildcard in the ongoing gang war.
Gong Myung
◾Birth Date: May 26, 1994
◾Birthplace: Seoul, South Korea
◾Debut Work: Infinite Power (2013)
◾Notable Works: Drinking Solo (2016), Be Melodramatic (2019), Lovers of the Red Sky (2021)
◾Social Media: Instagram
Choo Yeong-woo as Lee Geum-seon
A mysterious figure whose past ties him to both major clans, Lee Geum-seon operates in the shadows. He plays a crucial role in uncovering secrets that could shift the balance of power.
Choo Young-woo
◾Birth Date: June 5, 1999
◾Birthplace: South Korea
◾Debut Work: You Make Me Dance (2021)
◾Notable Works: Police University (2021), School 2021 (2021), Oasis (2023)
◾Social Media: Instagram
Jo Han-chul as Choi Seong-cheol
A veteran enforcer with years of experience in the criminal world, Choi Seong-cheol knows that survival often depends on choosing the right side at the right time.
Jo Han-chul
◾Birth Date: May 13, 1973
◾Birthplace: South Korea
◾Debut Work: My Dear Enemy (2008)
◾Notable Works: Hometown Cha-Cha-Cha (2021), Vincenzo (2021), Reborn Rich (2022)
◾Social Media: Not publicly available
Cha Seung-won as Teacher Kim
A legendary figure in the underworld, Teacher Kim is a mentor and enforcer with unmatched combat skills. Though he prefers to stay neutral, his involvement in the conflict may turn the tide of the war.
Cha Seung-won
◾Birth Date: June 7, 1970
◾Birthplace: Anyang, South Korea
◾Debut Work: Holiday in Seoul (1997)
◾Notable Works: City Hall (2009), You’re All Surrounded (2014), A Korean Odyssey (2017), Night in Paradise (2020), Our Blues (2022)
◾Social Media: Not publicly available
Lee Jun-hyuk as Nam Gi-seok
Nam Gi-jun’s younger brother, Nam Gi-seok, was drawn into the Joo-woon Clan, setting off the chain of events that led to the bloody gang war. His tragic fate fuels Gi-jun’s path of vengeance.
Lee Jun-hyuk
◾Birth Date: March 13, 1984
◾Birthplace: South Korea
◾Debut Work: First Wives’ Club (2007)
◾Notable Works: City Hunter (2011), Stranger (2017, 2020), Dark Hole (2021), The Roundup: No Way Out (2023)
◾Social Media: Instagram
Mercy for None ㅣPlot
After severing his own Achilles tendon and leaving the organization, Ki-joon returns to the criminal underworld after 11 years upon learning of his younger brother Ki-seok‘s death, who was the second-in-command. Driven by a desire for revenge, Ki-joon delves deep into the organization’s operations to uncover the truth behind his brother’s demise. The series promises intense action sequences and a gripping narrative that explores themes of loyalty, betrayal, and the quest for justice within the criminal underworld.
Point to watch
Original Webtoon of “Mercy for None”
Title (Original): 광장 (Gwangjang)
Title (English): Mercy for None
Authors: Oh Se-hyung (오세형, Story), Kim Kyun-tae (김균태, Art)
Publication Period: 2019 – 2022
Published on: KakaoPage (South Korea)
Genre: Crime, Action, Noir, Thriller
Originally published as a webtoon in South Korea, Gwangjang (Mercy for None) follows the intense power struggles between rival crime syndicates and individuals seeking revenge. The story revolves around Nam Gi-jun, a former gang member who returns to the underworld after his younger brother’s death. As he seeks vengeance, he becomes entangled in a web of betrayal, shifting alliances, and brutal conflicts.
The webtoon gained massive popularity due to its gritty storytelling, complex characters, and visually intense action sequences. It was highly praised for its realistic portrayal of the Korean underworld, exploring themes of loyalty, morality, and revenge. The fast-paced narrative and unpredictable twists kept readers engaged, making it one of the standout crime-thriller webtoons on KakaoPage.
Due to its success, Netflix announced a live-action adaptation of Mercy for None, bringing the high-stakes gang war to life with an all-star cast. The series is expected to retain the raw intensity of the original webtoon while expanding on its deep character relationships and dramatic action sequences.
A Star-Studded Cast That Demands Attention
With a star-studded cast featuring some of South Korea’s most renowned actors, Mercy for None is shaping up to be one of the most highly anticipated crime thrillers on Netflix. Veteran actors like Cha Seung-won and So Ji-sub bring their commanding presence to the series, while rising stars such as Gong Myung and Choo Young-woo add fresh energy to the intense narrative. Fans of the original webtoon have already expressed their excitement, praising So Ji-sub’s casting as Nam Gi-jun for its remarkable accuracy. As a project that blends seasoned talent with promising newcomers, Mercy for None is set to captivate audiences with its gripping story, high-octane action, and powerhouse performances.
Why I’m Looking Forward to Mercy for None
Mercy for None (Gwangjang) is shaping up to be one of the most intense and gripping Korean crime thrillers of 2025. Set in the dark and brutal world of South Korea’s criminal underworld, the series promises a compelling mix of revenge, power struggles, and raw action.
What excites me the most is the high-stakes narrative—a man who once walked away from the underworld is forced back in after his brother’s mysterious death. His journey to uncover the truth is bound to be filled with shocking betrayals, brutal confrontations, and a relentless pursuit of vengeance. If done right, this could be a Korean noir masterpiece in the making.
Another major reason to be excited is the star-studded cast. With seasoned actors like So Ji-sub, Heo Jun-ho, Cha Seung-won, and Lee Beom-soo, the performances are expected to be top-notch. So Ji-sub’s portrayal of a former gangster seeking revenge will likely bring a mix of emotional depth and intense action.
Moreover, South Korea has produced some of the best crime thrillers in recent years (A Model Family, My Name, Narco-Saints), and Mercy for None seems to follow in the footsteps of these gripping narratives. If the series maintains a gritty and realistic tone, with well-choreographed action sequences and a powerful storyline, it could be one of Netflix’s biggest K-drama hits of the year.
With its dark setting, brutal action, and top-tier cast, Mercy for None has everything needed for an unforgettable crime thriller. I can’t wait to see how this unfolds!
Mercy for None OST
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