!

I reread it from the beginning, and it's honestly incredible how different Jaeyi is with Ideum compared to everyone else (he most likely wasn't even this close with his previous sexual partners). Chapter by chapter, you can see him falling in love. There are so many little signs that he's actually been developing feelings for Ideum for quite some time. It's just that Jaeyi himself doesn't even understand what these emotions are like (he says so himself in Chapter 9, Page 49), so he doesn't realize that he's already become attached to him.
He licked his scar, respected the fact that Ideum wanted to keep it covered during their video call, apologized multiple times whenever he was late, gently stroked his face, and now he laughed as he pulled him into a hug while holding the back of his head, they slept together and Jaeyi hugged Ideum in the bed. They showered together, Jaeyi's apartment is literally right next door to Ideum's, yet instead of going home he stays the night there (he even has his own toothbrush at Ideum's place). He worries about Ideum—whether his scar is itchy, whether his throat hurts, whether he's in pain, or if he's been hurt and a lot of signs like this that I didn’t mentioned, also the way he looks at Ideum and his bodytalk.
GORGEOUS. So, yeah, we know he is gonna fall in love, or he is already in love, also Ideum starts to catch up. On the brother part, yes, Jaeyi’s older brother, Jiseung was Ideum’s first crush and classmate. (Yeah, he is 27 years old, the age 29 in the article was incorrect).
I don’t know whats gonna happen, but I start to feel nervous now.