Sucky characters

Gotta say I just couldnt finish watching this movie because of the annoyingly stupid characters. Whats up with the dude being schizofrenic? All shy and retarded on minute, then boldly stupid right after. I mean, he's never the first to say hello to the retarded teacher-girl, scared to even look her in the eyes. But in the park he got all the sudden super out going and friendly just to give a *beep* cold shoulder when she asked her out. Talking to nobody in his office. Talking to himself in public, sudden outburst. All mr.nice guy one scene then super jackass the other. I call that sign of schizophreni. Just got a feeling the story was written by a woman. Can't even imagine a dude would make up a unbelievable male character like that. And the female characters too. No real believeable personalities or reason for their actions. I just got the feeling this woman-story writer is one with no imagination or sense of logic. The director must also be one hell of a mongolicious man for even making this film after reading the script. This is the worst korean movie i've ever experienced.