I don't get it

i dont think he raped him either. I also dont know why people are calling the uke an ass etc. or what has he done that needs revenge.

from what i understand he was indifferent about any relationships he had, including with the yellow eyes (they were lovers) and he left him without a 2nd thought and even forgot about him. I dont think the seme wants revenge, its more like he wants to get back together with him and he thinks by raping him they will be still connected and go back to how things used to be.

it seems he played with the yellow eyed guy who was madly in love with him. the sex may be more or less consensual, but for me it feels like the kidnapped guy took advantage of the clueless cute boy. that's sad but cannot justify this madness. I hope for a big revelation *crossing fingers*

Maybe what's going on is that Donyun left the guy back in high school - maybe said something along the lines of: "we were just sex friends" or "we were just having fun, weren't we?" as if their relationship meant nothing to him. Or Donyun just cruelly broke up with the guy even though the guy still was very much in love.

But that's just my conjecture...

If you read the raws you could see that Sungho (the yellow eyed guy) became traumatized after Donyun's disappearance. Simple actions such as someone touching the back of his neck, he would react in an aggressive manner. I could understand some of the chinese lines so I came up with the assumption that back then Donyun had convinced Sungho to do sexual favors for him. It's gonna show it in a future chapter where Sungho looks very unwilling and hesitate.
In a sense Donyun did rape Sungho, when he was unwilling Donyun would continue to push and get Sungho to do it. Sungho convinced himself that it should be fine, after all, he loved him. Kinda like that one yaoi called Seishun Kinema where the Seme manipulated the Uke into only depending on him. I believe that's what Donyun had done, used Sungho's feelings in order to satisfy his cravings, never did he love him. Soon Donyun would suddenly disappear and Sungho would come to realize this. That he was just used. (Sungho calling Donyun selfish) Sungho someone who had no friends in school, completely dependent on Donyun like a puppy would soon drown in in the past, unable to move on. Before he knows it, he's become twisted as he in trapped in what used to be, all of these anguish feelings he'll point towards none other than the one who took away his innocence, Donyun.
Eveything that Sungho is doing to Donyun, Donyun had done to Sungho in high school. Sungho is trying to get back at Donyun by making him feel what he felt back then, trapped in that small storage room, violated, etc.

That's just my theory tho :x
I haven't read that far into the raws because I didn't wanna spoil myself to much so yeah.

@ggster
Perfect theory! I think you just solved it! Or at least i hope so because if would be interesting to see that!

Just a guess, but I think even in school, Sungho liked Dohyun way more than he liked him. Even though Dohyun was dominant back then, maybe he was a prude who never put out, & Sungho is doing all the things to Dohyun he wished had been done to him.... Of course that would make him a sexual masochist when ge's clearly more of a sadist.

Seems more like Sungho wanted to be more dominant/active during sex and Dohyun wouldn't let him, so now he's acting out his fantasies. Even the nape touching and tickling has elements of a power struggle. Dohyun was allowed to touch Sungho, but Sungho was never allowed to touch Dohyun.

bingo, I think that crazy Seme have an obsession with him. that's all XD and when the uke left him he decided "hii fuck it, let's imprisoned him in a room." he's crazy so...

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Here's the Korean raws: https://webtoon.bamtoki.com/%EA%B0%90%EA%B8%88%EC%B0%BD%EA%B3%A0-34.html