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I have to say as much as I feel sad for Bum about his terrible past with his Uncle, he is not someone to be considered "precious". Sure if he doesn't end up going to jail in the end I'm fine with that and have nothing against it, I don't think he would ever murder or harm anyone else at all... But he is not innocent at all. From the start, he stalked Sangwoo pretty bad, invaded his home which is illegal, and pretty much murdered the girl intentionally not really showing remorse for what he did. He is just showing he is scared of getting caught really. Yes it ultimately happened because he was influenced by Sangwoo in a way..
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People ship them probably because they both are not saint. It just happened that one is abusing another and the latter loves him. Although I do not ship them, just because this kind of relationship is prohibited by law and it reminds me of those creepy kidnap movies.
I see Yoonbum as he kind of chose this destiny, as if he wanted something like that. Prolly they both have abuse fetish.
I wanted to state my overall review from this comment section, and also here's the link to my other comment explaining why I believe Yoobum is a innocent person.
http://www.mangago.zone/home/mangatopic/2020908/
Anyway to the point of this comment, I wanted to explain why I believe Yoobum deserves freedom. Sangwoo, as explained suffers from a possibility of a personality disorder, or a mental illnesses were not aware of( which is extremely fascinating for me, who takes interest in psychology). But what brings to my attention, is to the people who overly exaggerate how they love the character, and how this effects the relationship between Yoobum and sangwoo. Don't get it? Here let me explain, Imagine sangwoo as a old man with unflattering facial features. Ok now think of all the other characters who had fascinating character input, but people didn't give a shit because they were unsatisfacting, and ugly. Now think about the fangirls who ship sangwoo and Yoobum, I have no problem people shipping, I repeat NO PROBLEM AT ALL. But, people who just want a spark of hope of sangwoo treating him, Yoobum nicely is fairly low of a chance. And, I fairly do believe people wouldn't like sangwoo as they do now, if he wasn't "attrative" as he is in the manga. Of course, this isn't all of the fandom, just some specific people I spotted, and I wanted to reason with you of how the character looked would have affected the storyline. Then again, his looks did play a good role in the story to collect chicks. At the end of the day, I just want Yoobum his freedom. a loving partner, and social skills. Have a good day.