I think whoever uploaded the chapters fucked them up ngl, not only do some things repeat but it kind of seems to me like a good chunk of chapters are missing. Although it might also be the way this webtoon was made, not sure since I haven't seen it on the official site.
Also, she is a girl. The MC uses he pronouns because she mistook her for a boy. It was also mentioned she doesn't mind any pronouns used for her but she prefers she/her. And she is also something called a butch, which means she is someone whose appearance and behaviour are seen as traditionally masculine.
And wtf does her breast size have to do with anything btw?? Feminine women can also have small breasts, bruh.
You guys are so incredibly annoying. I admit I didn't have to write 'as flat as a board', but I didn't mean anyone real by it and I was trying my best to be nice to you all the time. Sometimes it really makes me doubt the competence of humanity when I see comments like yours, where people think they can insult anything and anyone just because they can't see each other in real life.

I'm so confused. First, am I tripping, or do you not actually progress through the first few chapters and the same things just keep repeating after you finish one? And second, is she/he a girl or a boy? She/he was referred to as "she" or "he" several times and has a chest as flat as a washboard.
#-.-)