this is exactly what I first thought and it's quite make sense to me, Seungho seems so upset (angry ?) after that.
I hope we'll have some developement in the next chapters (╯°Д °)╯╧╧
( I'm not a native english speaker so I'm trully happy and thankfull someone wrote in english what I was french thinking since the last 4 hours :'D )
I think he’s just angry with himself if that makes sense. He’s upset that he can’t seem to get nakyum to open up and feel comfortable around him like he did with inhun. When Nakyum doesn’t share his feelings of his own accord, Seungho gets frustrated because he WANTS to know what the painter is feeling but doesn’t want to share his emotions and meet his lover half way. It’s then that he tries to force it out of Nakyum by treating him roughly and he ends up making him cry all over again. He clearly loves Nakyum, more so than he’s ever loved anyone and that scares him. He doesn’t want to lose nakyum but at the same time Doesn’t want to communicate because he doesn’t know how.
The last panel of chapter 49 is interesting to me....
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I think those bubbles are meant to be Seunghos at the end,in which he’s making excuses for how much it appears he cares about Nakyum, excusing it by saying he’s just going to let his body take control and not talk about his feelings or ask Nakyum about his. But in the last panel he looks like he almost contradicts this. He puts his entire body over Nakyum very possessively with a scowl on his face. Sex is intimate of course, but what Seungho now does with Nakyum is really more akin to “love-making” in the way that he’s much more affectionate and sweet in the way he touches Nakyum. Seungho can say that it’s sex all he wants, but he never touched or held ANY of his other partners the way he does Nakyum, and that’s how you know everything he says at the end of the chapter is pretty much a lie.