
Maybe I'm slightly biased since this was one of my first bls but I love these two!! they're not flat characters they're like the most realistic they can be without the trope disappearing? if that makes sense? Like right on the line I guess lol if anything those "intense mood swings" are sometimes comedic after that one scene where he cuts apples for him and they eat at school lol iust panel after panel lol like the face game where you switch expressions when your hand goes up and down over your face its not like it's never funny so it fits in with the rest of the story guysssssssss I swearrr the author is laughing with us (my take lol) but that's kind of the charm objectively it's a really well done manhwa like seriously there are things that you don't notice easily becauseeee they're well done so..yeah

All the details that suddenly emerge with this huge clue...suddenly I want to reread
Anyways...if I had to guess about the letter...sexual harassment from his uncle? I'm thinking dried up cum as a "gift" and a shitty message with it. But would that be strong enough to evoke vomit? The way the letter is folded excludes pretty much everything else though...unless its a ...pic printed small enough. Ugh to torment the victim for so long...evil...not to mention the power the uncle holds over him and his brother. No wonder he gets so mad at heonjae when he messes up....hes prpbably trying his best for both of them...but then again...why wouldn't he get the letters if they're from the uncle? He'd want it delievered instead of blocking his access. Unless it's someone else doing that? Not that he'd be the only sender...idk anymore....just wow..

Ah, eyy it's you from the ratatouille meme comment haha. Just wanna tell you the letters are from the blind Noona, not the Uncle. Jingi asked her to send them saying "Please send the thing on the 5th" at the end of chapter 20.
And what Myeong-il saw, in my theory, is a photo. A very disturbing photo, that made Myeong-il vomit from just one look. Jingi asked the Noona to develop the photos (flashback in chapter 34) then send it to him.
I think the letter contains photographic evidence against the creepy Uncle. But Myeong-il just saw the incriminating photo and misunderstood Jingi.
Quite the opposite of aftercare for the last chp....poor apollo....I grew a soft spot for him....HOW COULD HE DO THAT TO HIMP???? But lol who causes an explosion when they cum haha