First of all, I felt the 2nd couple had more chemistry than the first. I think the ML (IDK names but the one who hurt his leg) was kinda boring and his character was kinda based around the fact his leg was injured, he also looked like he could be a teacher, not a student so it felt more like a student-teacher relationship that 2 students.
The ending was VERY unsatisfying for how much time was spent building up this couple to get only a few mins at the end of them together. The other ML (the new boy) His character seemed to suddenly changed as soon as he knew he liked the ML which was kinda strange like he was 2 different people it didn't bother me too much I just felt as though their characters were kinda bland and the story was just meh.

The 2 stepbrothers, on the other hand, were super cute, they didn't get loads of screen type except near the end and honestly their little moments was better than all of the main couples altogether.

The series would have been 100% better if it was just about the brothers not that I am into step sibling storylines in BL's but they had so much more chemistry and cute moments I could look past it.