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not incorrect actually

In the first chapter, the MC mentioned being an accident that almost cost his life. That could have something to do with his memory loss. It may not be his fault. That accident might have caused some brain damage and his inability to remember the faces or names of people in high school.
However, his captor may be reading it as "so you just casually forgot what you did". Which seems to piss him off.
I think the two were in a consensual relationship. However the MC was the seme and yellow eyes was the uke.
Apparently this uke did not like being dumped at all. Now he's a rapist and monster.

yall aren't too far off from the truth, actually. take it from someone who is korean. dont want to spoil anything, but keep thinking the way you are

Mate that's exactly what the authors said on twitter.
My theory is probs totally incorrect, but I feel like the two of them were in some kind of romantic relationship in the past o: then some incident occurred, and he forgot everything surrounding that time. So now, the dude is trying to recreate the same setting where they used to have so many cherished memories together, to try and get him to remember the memories he blocked out???