I just watched the 2003 Korean film "Oldboy", and as much as I enjoyed the gritty feel to it, I'm still left with a major dilemma I've noticed yet haven't seen discussed. I understand that the antagonist was trying to put Oh Dae-su in the same situation he was in years before. However, there's no changing the fact that the antagonist was intentionally being incestuous. There really is no avoiding that fact. Yes, he was able to make Oh Dae-su have intercourse with his own daughter, but in the end Oh Dae-su never intentionally engaged in incest.
This leaves the antagonist as someone who messed around with his sister, then suffered severe consequences for his actions. He then decided to shift the burden of responsibility to a kid (Oh Dae-su, who probably would have done the same as any other kid in his situation who sees a classmate fooling around with his sister), wrongfully imprisons him for 15 years, only to play some brutal and twisted mind games with him just after he's released. To top it off, once he gets his revenge, he offs himself.
I see the antagonist as a sociopath who seriously needed therapy and prison time. I can't say I really sympathize for him. Oh Dae-su on the other hand, though not innocent, is victim to punishment he ultimately doesn't deserve.
Does anyone else see it this way or is there something I'm not quite grasping?