
It's def gonna span multiple chapters. I think it's reasonable plot-wise that he still behaves like this because nothing happened yet to actually force him to process/confront his feelings. And I don't think he's a lost cause considering how low the bar was for him in the earlier chapters, he just still has a lot to work on.

Idk why my comments keeps getting cut short lmao I didn't just write those two words ╥﹏╥
So yes as I wrote, I totally agree with you, plus when their story began, he couldn't even watch Garam's face during the act coz he said it was a turn off, now even just seeing it can make him horny, that and the fact that he keeps trying to be more intimate with him, like trying to kiss him is also a pretty big change for him. For him to even also admit that he finds Garam cute on multiple occasions, that's already a huge step. Now I can only sit and watch hoping that the start of the acceptance of his feelings comes soon (๑•ㅂ•)و✧
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Disclaimer, I'm too sleepy to fully comprehend the chapter, but good news for Jaehyuk haters, Garam squeezed his dick and kicked his balls. He ain't the brightest this chapter, saying shit like his dick can't stand to others because Garam passed his gayness to him and that Garam should take responsibility for it till he's better. The kick was deserved!
What's interesting though is that Garam knows that Jaehyuk is really just like this because he likes him. He thought someone like Jaehyuk who sleeps around couldn't have been clueless about his own feelings, but it's because he's someone who can't even imagine the thought of a guy liking another guy in the first place. So Garam firmly rejected him and Jaehyuk got his first heartbreak (man literally clutched his chest).
Jaehyuk's development is slow af tho. It's like we kinda have come so far but there's still a long way to go, it's def not for the impatient. Anyway, the next chapters are about to be interesting. Garam said Jaehyuk should stop clinging onto someone (he said) he doesn't like but Jaehyuk is def gonna chase after him. Hopefully he gets significant development while he's at it.