When it comes to Kim Sung-kyun’s filmography, one standout performance definitely comes to mind—his highest rated work is widely considered to be Nameless Gangster, released back in 2012. That role really showcased Kim Sung-kyun’s range and depth as an actor, earning both critical acclaim and audience appreciation. On the other hand, among his more recent projects, The Prison from 2017 tends to rank lower in terms of ratings. While it still had its moments, it didn’t quite resonate the same way for most viewers. So overall, when looking at Kim Sung-kyun’s career highlights and less successful ventures, these two films really mark the high and low points. Kim Sung-kyun has certainly had his ups and downs, but performances like the one in Nameless Gangster remind us why Kim Sung-kyun remains a respected figure in the industry.