Mercy for None

Mercy for None is a 2025 South Korean action noir television series written by Yoo Ki-seong, directed by Choi Sung-eun, and starring So Ji-sub, Huh Joon-ho, Ahn Gil-kang, Lee Beom-soo, Gong Myung, Choo Young-woo, and Jo Han-chul. It was released on Netflix on June 6, 2025.

Synopsis

Nam Gi-jun, a former criminal gang enforcer, leaves his brother and criminal past behind after an incident. Eleven years later, his younger brother, Nam Gi-seok, is brutally murdered, forcing Gi-jun back into the world of crime to uncover the truth and seek brutal revenge on those responsible.

Cast and characters

Main

So Ji-sub as Nam Gi-jun
Huh Joon-ho as Lee Joo-woon
Ahn Gil-kang as Gu Bong-san
Lee Beom-soo as Sim Sung-won
Gong Myung as Gu Jun-mo
Choo Young-woo as Lee Geum-son
Jo Han-chul as Choi Sung-cheol

Supporting

Joowoon

Jung Gun-joo as Chun Hae-bum

Bongsan

Ahn Se-ho as Kim Chun-seok
Kang Shin-hyo as Hong Hyun-seok

Others

Ji Yi-soo as a female employee of N.Clean
Kim Hak-sun as Han Seok-yoon
Ku Sung-hwan as a detective of the Seoul Metropolitan Police Agency
Lee Sang-hee as a lawyer
Lee Ki-young as a doctor of Taekwang Clinic
Lee Jae-yoon as Kaneyama / Kim Gil-rok
Kim Tae-in as Jung In-seok
Don Mills as Hyung-jin

Special appearances

Cha Seung-won as Cha Yeong-do / Mr. Kim
Lee Joon-hyuk as Nam Gi-seok

Production

Development

The series is based on the webtoon Plaza Wars: Mercy for None by Oh Se-hyung and Kim Geun-tae. It is directed by Choi Sung-eun, written by Yoo Ki-seong, and produced by Yong film and Studio N.

Casting

In February 2023, So Ji-sub was cast to appear as the lead in the series. In July, Gong Myung was cast and positively reviewing the script. In August, Lee Joon-hyuk, Huh Joon-ho, Lee Beom-soo,, and Ahn Gil-kang were cast with the former making a special appearance.

Filming

Principal photography began in the second half of 2023.

Release

The series was released on Netflix on June 6, 2025.