Come on, did yall really think Seungho was going to change overnight? Of course he was going to deny it and Nakyum is feeling something too. They are both in denial. I did feel bad when Nakyum got high and drunk but Seungho stop them. He likes him, its going to take something major for them to get together. Maybe like an assassination hit...
Sid is a backstabbing betrayer (literally) and a rapist. When Cain asked Sid if he ever mistreated him, I lowkey got teary eyed because Cain truly trusted him and couldn't figure out why Sid is killing him to the point that he had to ask him. That's deep.
In the raws, Cain pretty much gave Sid everything. His extremely long hair (he was severely ugly at one point) and his position and was the only one that listened to him when they were younger. Yeah, Sid has this parasite thing controlling him but it only acts on Sid's unconscious meaning Sid already thinks this, the parasite only brings it out more. Sid wants complete control, he doesn't want to be Cain's right hand man anymore. He wants to defeat Satan and become the ruler of hell himself.
We're not gonna talk about Seungho kissing Nakyum while he was sleeping. Seungho doesn't even know he's falling for Nakyum. He looked so confused.
I was looking at those panels a lot, at SH's expressions and I'd say he might actually have a little realisation. I agree with you, he's very confused as to what he's feeling exactly, but I think it's starting to get to him, he's not stupid after all. He might realise the feelings, but try to suppress them.
Spoiler below
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I loved how he panicked for a moment when he though NK passed out again, and then paused just looking at him, holding his face and kissing him. Ahh, dude, you're doomed! You love that painter (=・ω・=)
Let me say, quick summary
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Sick Seungho is gorgeous. Blushing Naykyum is cute. Seungho smoked all the opium and alcohol and he can't understand what his feelings are for Nakyum. He passes out and he's sick. Nakyum stays by his side wiping his forehead and realizes that Seungho has feelings for him.