From Oldboy to Burning, South Korea has proven that it has no problem delivering a quality revenge tale. In series format, this isn't any different and a new title is arriving to underscore this fact. Mercy For None is a new action K-drama that is coming to Netflix next month, and centers around a dangerous killer who returns to the underworld of crime after his brother is killed. The series is set to premiere on June 6, and you can check out the trailer in this article.