Oldboy : What a psychopath! (Spoiler light)

What a psychopath! (Spoiler light)

The main antagonist, not named because of the risk of spoiling: What a dysfunctional, crazy lunatic of a psychopath!

His plot barely tangented my mind when Josh recalled the green house scene, but I was quick to write it off thinking that "no one can be that insane!". Not even in a factional movie. I was wrong.