So I think this is villainess kind of story, MC is hated by everyone but aside from the 'good girl'. The good girl actually cares about her and is just being dragged along by the male characters like her having the same dress as the MC but immediately decided to change after seeing the MC.
Any manga like Under the Oak Tree? I've read a manhwa like that but when I tried to re-read it I found Under the oak tree
I vaguely remember a character with a long black hair in a ponytail who has a crush(?) on the male protagonist but is having this situation where he(?) tried to fight his feelings because he wants to be a man or something?
I think the person can choose their gender at a certain age. There is also a scene where that person decided to dress up as a girl but it didn't go anywhere (based on my memory)