One of my favourite body swap dramas but was a bit let down in the end

I loved the first 17-18 episodes. It was funny, and they went from hating each other to relying on one another. But I really didn't like the plot where the ML was just trying to get revenge on the FL for misunderstanding which he didn't know, and the fact that FL didn't know how to apologise back then and never had the guts to even in the present. I wish the ML bubbly personality was real and not just show for the most part. But good ending anyway.

Just why?

sorry but did not like this at all. Useless breakup. I never liked love triangles tropes but this one was the nail in the coffin, so irritating, Also, why is the male lead so mature, he is still in HS? The story about beauty and bullying is the only thing that keeps me from rating this lower.