I loved Bae Joon Young in Solomon's Perjury. Aww.
For recommendations, An Innocent Mistake comes to mind. The nature of the dysfunction is slowly revealed over the course of the show, though, and is not super-obvious from the start. So it's kind of similar to Joon Young in Solomon's Perjury in that way. Also similar feelings of guilt and blame and resentment, although the reasons are different.
I would agree that there are tons of male leads with family issues, but the way Joon Young's issues with his mom played out is kind of unusual. An Innocent Mistake is the closest I can come, though. Hope that helps, and I'm curious what other answers you get.
(off topic from Asian dramas, but you might try the old American movie Ordinary People because it's got a similar mother-son dynamic, minus the romantic interest helping in any way. One of my favorite movies ever)