
I don't think Seungho was reveling in Nakyum not knowing. I think he was "happy" and kind of excited and really wanted Nakyum to realize it. I get how twisted that sounds, but it was kind of his way of flirting and I think he assumed that Nakyum remembered at least a little. He keeps asking Nakyum why he doesn't remember anything and he even drops hints (like asking if he got pregnant or giving him medicine for drinking too much). I think Seungho miscalculated and got excited about Nakyums feelings in bed and didn't realize how much it sucks for him that Nakyum meant them for someone else. I don't mean this in a sappy way. I literally think Seungho thought he could have Nakyum after getting his body. Afterall, everyone else he's known has been debaucherous and fallen for his dick talent lol.
Like in Seungho's mind, at least a little bit, he's going damn I gave you the best night ever and you're not even going to like me for it a little??? What has that learned sir ever done for you???

I agree so much here. That's his twisted flirt and Nakyum is clueless. Frustrating him more, giving him wrong picture and he took the worst action to "refresh his memory".
And I think he's jealous of his learned sir since the very beginning and it's the sole reason he sook him out.
To me, Seungho is comparing himself with Inhun more than he realize. He was just curious about Nakyum's crush at first. But upon meeting and watching the both of them interacting, Seungho must be thinking "what does he have that I lack".

You know what, I just accused someone of dumbing down his character by claiming he was genuinely excited but the way you explained it makes me feel like a bit of an idiot for thinking there was no other way lmao. Even I said he has a childlike cruelty(and immediately went back on my word cause I'm mentally unstable myself XD), what you said supports the idea of him having a warped perception of love and, in retrospect, that makes sense for his character. You explained that theory SO much better though tbh
That would be much more interesting if that was his train of thought actually. Good point.
Spoilers for Chapter 26
\\\
\\\
-----------------------------------------------------------
This is definitely going where I hoped it would and I'm fucking ready! I'm so glad I had faith and stuck with the mangaka, it was all worth it seeing NaKyum finally start putting his foot down. I honestly was starting to dislike him because I thought he was going the "weak and docile bottom" route but now I see that he can hold his own. And let's not diminish how bad ass it to stand up to someone like Seungho who could smite him in a second. I totally understand him being submissive in his situation but I feel so much better knowing he's not totally helpless.
I don't know what Seungho was saying but I'm so damn curious now. I'm personally still thinking Seungho is more sinister than love-motivated tbh. It's hard for me to see love as a powerful motivator for him. Don't get me wrong, I absolutely think that NaKyum is going to take Seungho for an emotional ride and he ain't ready, but right now I think he just can't come to grips with the idea of someone rejecting him. Especially someone he wants to possess.
Idk I'm conflicted, there were some brilliant Seungho analyses below that made me consider Seungho's feeling a bit deeper. Seungho is too complex and mysterious a character to leave it at that. And, shit, the author is so damn boss at drawing expressions you could read subtle emotions on Seungho's face that lie below the surface. With that said:
The date rape scene was quite beautiful looking back. Not in and of itself but through the eyes of a writer. I notice that Beon (the mangaka) will almost seem to write through Seungho's POV at various times, that scene somehow was portrayed as passionate love making w/o dismissing the horror of the act itself. It's because for /Seungho/ that was most likely the first time he actually made love.
One really good analysis said that Seungho's attraction towards NaKyum intensified during the date rape scene. I 100% agree, I think that's when he moved from fascination and fetish (getting off at fucking a lowborn) to genuine infatuation. Seungho is the epitome of a fucknigga so he definitely was just trying to get some ass at first but it's almost like he turned NaKyum out physically and NaKyum turned him out emotionally because he caught feelings strong after that lol
However, I read someone else say Seungho is like a fox. It's THAT part of him that makes me reluctant to go the sappy route. Seungho has an incredibly warped view of of everyone around him and NaKyum is absolutely the only person that's ever forced Seungho to confront more genuine emotions inside himself but Seungho still has a childlike cruelty about him. Reading the translation for ch. 23 you could see that he was reveling in the idea that NaKyum didn't know what happened that night. He enjoyed having that knowledge over him and was almost smug about taking advantage of him.
Let's not get things twisted, we cannot expect someone like that to have a similar moral compass to us. We can't project our way of empathizing on him too much because he does think more along the lines of a psychopath. I really think some people are almost down-playing his sinister tendencies by saying his actions are a product of the era/environment or that he had a troubled past, or even that he can't handle these new emotions towards NaKyum. This dude is a master manipulator who plays everyone like pawns. Y'all think Jihwa didn't fall under his spell for example?, that's probably why he's so obsessed with Seungho in the first place. NaKyum is a pawn that ended up being way more than Seungho bargained for, might even be his downfall, but Seungho will most likely try to keep him that way by any means.
What I predict (and hope for) is that there's going to be a BIG power struggle between NaKyum and Seungho coming up since NaKyum is showing he has a stronger mind than Seungho anticipated.
That is if Seungho don't kill his ass XD had a damn heart attack when he pulled that sword out at the end.