trying to put it into words
In his brain, it goes like this: everything Mark just said + them holding hands right now + Mark looking like he wants to jump off a plane + the out of place offense at Donghyuck not taking his offer seriously + him sitting here, with Donghyuck, not even watching the movie that was probably very loudly distracting him from completing his time-sensitive essay = the second epiphany.
Donghyuck's eyes widen. “Oh my god. You’re totally in love with me.”