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I agree with you about it being Junghyuk being a bit dangerous, but actually a lot of what he supposedly did wasn't explained. The way he invaded Taesu's personal space by getting a copy of his apartment key wasn't fully developed. So in the end, we don't know for sure, but we have an idea. Also, I suppose Junghyuk was better since he didn't try to harm any people involved with Taesu, and only took action to protect Taesu.
Plus, that psycho bastard was insane and prepared to be a murderer and killed himself to leave a scar on someone's mind because of a grudge from the past. I don't Junghyuk was nearly as bad as him. Not to mention when he tried to prevent Taesu from walking ever again because he "wanted Taesu to rely on him."
I do disagree with you on the dating thing though. I think there were a couple of time skips before that and a few weeks of time in between the proposal and the dating. Plus, apparently they were in love since they were kids.......so in my opinion, the proposal was perfect. ε=ε=(ノ≧∇≦)ノ
I liked the second couple more than the first. Crazy obsessive people should be avoided and taken to therapy, what would happen if Taesu wants to break up in the future? And the proposal after like, 2 days of dating? I know it was aimed at 'cute, passionate strong love' but Junghyuk was actually a couple steps away from being like that crazy ass classmate who stabbed himself. What do you guys think? (⌒▽⌒)