
Haejoon collapsed probably because he's been injured a few times recently, plus the mental/psychological exhaustion caused by going back to his house and facing his trauma and the reality that his mother is dead.
We know he thinks of Eunyung as a younger brother but it's nice to get it confirmed like this. Tbh, I do ship Haejoon and Eunyung but it doesn't seem like the author is going that route, especially since Haejoon is aware of the "pretty girl" being interested in him.
Having said that, I still hope Haejoon and Eunyung live together even if Haejoon goes to college and after that. My prediction is that Eunyung will call Haejoon "hyung" before this ends because we also know Eunyung thinks of him as an older brother, a friend, a person to come home to. They are each other's home. Their connection is different from their friends and that's why they are the main characters on the cover.
I hate math like the mangaka and this made me laugh. This deserves more views and a higher rating. It's not marked as complete so if there are more/extra chapters I hope it gets translated.
It's a good, light read.