Here's what I interpreted happened in Ch30 to last s1 chapter (I don't speak Vietnamese and I read it in a Vietnamese sight so some infos are bound to be wrong as I only comprehended it)
The chapter begins with MC knocking at Ml's door, who was surprised and called I'm assuming his parents who were at the beach and probably asked him to deal with it and he did. They spent time together the next few chapters before they most likely got together because they kissed.
Then, they were probably about to start fuc**** inside school but the door crept open, revealing Minwoo. Minwoo saw this and didn't hesitate to attack Ml, to his absolute surprise, MC protected Ml by blocking Minwoo's reach from the ml.
Again, this is just my comprehension, things are probably wrong.
I'm 20 years old
In a relationship with R.
In a relationship with R.