Responses
I don't think you should be any more worried about Koogi knowing how abusive relationships works than you should someone who has taken psychology class and knows about it. You don't have to personally experience it to be knowledgeable about it.
SPOILER (kinda) of chap. 18
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He's grooming Bum to become like him!!! Huhuhu! And it's going to be so easy because Bum is sooo in love with him no matter what he does. This is so sad. Huhuhu! ╥﹏╥
I'm so mad at Sangwoo but at the same time I want to get inside his head and find out what he's thinking, why, and how the fuck did things end up this way. (/TДT)/
But on another note, the author is doing an awesome job at depicting what goes on in a psychopath-victim relationship.