it’s been a bit since i read it but from what i remember here are some of the bigger things!
cha yun keeps picking a fight with seojung to the point the viewers commenting are like seojung is an angel and cha yun is the devil incarnate (we saw a bit of this in one of the end comments but there’s more in the novel they tear it all apart lol)
i believe cha yun comes from a well off family who did not approve of their relationship and may have blamed seojung for the accident? don’t quote me on that lol i also believe it was a car accident and poor seojung has trauma now being in the car with other people driving, i don’t remember if he was in the accident as well
they used to work together! cha yun as a pilot and seojung in air traffic control (another reason the comments are so important! you see people coming out with info about them and the fan reactions to it all). after the accident i don’t think he’s able to pilot anymore but i can’t remember if it’s just due to amnesia
cha yun tries to talk to and do nice things for seojung but it always looks like he’s picking a fight (sometimes it really is just seojung making crazy conclusions but they’re both going through it) especially once dabin (who also works at the same airport!) shows up as a surprise extra member
the last part is what i eventually got sick of. it eventually got to the point where i was genuinely feeling bad for cha yun and seojung started annoying me like just TALK so hopefully they fix the pacing while still keeping some of the good funny moments ;p

didn’t finish the novel because it felt like it was dragging and kept going in circles… hopefully this doesn’t feel the same! the comments were honestly my favorite part, i hope we get to see more of them and not just a small cut of them at the end ^^
also bummer it’s already a victim of the ai bot fight blegh