All the thought bubbles are NK's. The reason the last images focus on SH's face and not NK's is because those thoughts are in complete contrast to SH's own. He wants NK to tell him what's on his mind. He wants to know why NK is so submissive. He wants there to be more between them than just sex. That was a face of desperation right there.
SPOILER
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My heart hurts for both of them. You can see the pain in SH's eyes as he realizes NK is acting like a prostitute who'd do anything to please him and not a lover who cares for his partner. SH obviously must have believed the change and NK's meekness was because NK had started to grow fond of him but now he knows that it's not the case and it's a painful reveal.
The only reason he snapped and started acting like his crazy self is because NK refuses to answer him and continues to act like a prostitute. SH wants the old NK back. He wants a person, a lover, not a subservient prostitute.
When he repeated the phrase 'I keep you around for this' multiple times you can see that he's realizing that he doesn't in fact keep him around for that at all. That he cares for Na-Kyum and that it isn't all about sex.
I truly cannot wait for the next chapter. I want NK to tell him what that fucker In-hun said and I want SH to clear up this misunderstanding and then go stab that four eyes and send him to hell.
I'd punch that ugly jealous bitch servant in the face and then pull Na-Kyum into a massive hug and tell him how precious he is. Then I'd give SH an earful and tell him that he better treat our precious cinnamon roll better or he'll get stabbed in the dick by me and the fandom. Next I'd head out to deal with four eyes, no name and the spurned exes (╯°Д °)╯╧╧



I hope we'll get to see SH and learn why he's currently spending his time drinking and such. I'm guessing it's one of two reasons (or maybe both). 1 - a part of him is in denial of his feelings and so he's trying to distance himself from NK , 2 - he wants to show NK that he isn't merely keeping him by his side for sex and that NK isn't a prostitute.
The major downside with his current distancing is of course as we learned in the recent chapter, that NK is left vulnerable and open. That servant can easily lead NK outside of the complex without SH noticing.
Ugh. I can't wait for Friday to come. I hate the waiting game. Sometimes I wish I could simply slip into a coma and wake up whenever I feel like.