“Mercy for None”:Cast & Filming Locations
“Mercy for None” is highly anticipated due to its stellar cast, compelling storyline, and the reputation of its production team. Viewers can expect intense action sequences, a sophisticated noir atmosphere, and a deep dive into the complexities of revenge and the criminal underworld.
With its blend of action, noir elements, and a revenge-driven plot, “Mercy for None” is poised to be a significant addition to Netflix’s lineup of Korean dramas in 2025, potentially setting a new standard for the crime drama genre on the platform.
Main Cast of “Mercy for None”

- So Ji-sub as Nam Gi-jun: The protagonist and former gangster who returns to the underworld after 11 years to seek revenge for his brother’s death. So Ji-sub, known for his roles in “Doctor Lawyer” and “A Company Man,” brings his charismatic presence to this noir action drama.
- Heo Jun-ho as Lee Joo-woon: The CEO of the Joowoon organization, which Gi-jun was formerly a part of. Heo Jun-ho, recognized for his performances in “Kingdom” and “Bloodhounds,” portrays this powerful gang leader.
- Ahn Gil-kang as Gu Bong-san: The head of the rival Bongsan organization. Ahn Gil-kang, known for his roles in “Sell Your Haunted House” and “A Shop for Killers,” plays this formidable antagonist.
- Lee Beom-soo as Sim Seong-won: The CEO of Enclean, a company responsible for cleaning up crime scenes. His character seems to be involved in Gi-seok’s death.
- Gong Myung as Koo Jun-mo: The successor to the Bongsan organization, which has evolved from a gang into a corporation.
- Choo Young-woo as Lee Geum-son: Lee Joo-woon’s son, who is currently working as a prosecutor but harbors unpredictable ambitions.
- Jo Han-chul as Choi Seong-cheol: The right-hand man of Lee Joo-woon and his closest confidant.
Special Appearances
- Lee Jun-hyuk as Nam Gi-seok: Gi-jun’s younger brother whose mysterious death triggers the events of the series. Lee Jun-hyuk makes a special appearance in this pivotal role.
- Cha Seung-won as Mr. Kim: A character who exists for the coexistence of the two rival organizations. Cha Seung-won, known for his roles in “Believer” and “Night in Paradise,” makes a special appearance in this intriguing role
Special appearances include:
- Lee Jun-hyuk as Nam Gi-seok, Gi-jun’s younger brother
- Cha Seung-won as Mr. Kim
Plot and Original Work of “Mercy for None”
“Mercy for None” is based on a Naver webtoon of the same name. The story follows Nam Gi-jun, an ex-gangster who left the criminal world 11 years ago by cutting his own Achilles tendon. He returns to seek answers and revenge for his younger brother’s mysterious death.
While the drama adaptation is expected to stay true to the original webtoon’s core narrative, it may offer a more in-depth character development and enhanced action sequences. The series aims to appeal to a global audience while maintaining the noir sensibilities of the source material.
Production Details of “Mercy for None”
- Director: Choi Sung-eun
- Screenplay: Kyun Tae Kim
- Original Author: Oh Se Hyung (webtoon creator)
- Production Companies: Studio Dragon and Netflix (co-production)
Filming Locations of “Mercy for None”
Seoul Metropolitan Area
- Gangnam District: Several scenes were filmed in this upscale area of Seoul, known for its modern architecture and bustling streets. The sleek office buildings and high-end restaurants in Gangnam provide a stark contrast to the underworld elements of the story.
- Itaewon: This multicultural district in Seoul was used for some of the nightlife scenes, capturing the vibrant and sometimes dangerous energy of the city after dark.
- Incheon: The port city of Incheon, particularly its industrial areas and docks, served as a backdrop for some of the more intense action sequences and clandestine meetings between characters.
Busan
Gamcheon Culture Village: The colorful hillside community of Gamcheon provided a unique visual element for some of the drama’s more contemplative moments.
Jagalchi Fish Market: This famous fish market in Busan was reportedly used for a chase scene, utilizing its narrow alleys and crowded spaces to create tension and excitement.

With years of experience in international aviation, coupled with a background in travel journalism, I offer a wealth of expertise in the field of tourism. As an avid traveler and enthusiast, I am dedicated to sharing my knowledge and insights to help you embark on unforgettable journeys.