Responses
Nope. Woohui said jiho is smart so there was no misunderstanding. Her bestfriend back then did like jiho but rumor start going around when jiho in a hospital saying they're both gay. Her bestfriend couldn't handle being shame alone so she backtrack and put all the shame on jiho even badmouthing her behind her back. So now jiho afraid that woohui might do the same and they'll never see each other again.
You actually misunderstood the flashback chapter but maybe you're a kid and don't understand things easily.
Jiho with her old school friend was like jiho might have thought she liked her and maybe jiho ask her to date as her reward for winning a race and old girl must have said No and ask jiho is it that she thought she liked her in that way and jiho might have said yes and old girl said well then we were never really friends if that was your goal and then told jiho to duck off with her gay self and that was the friendship destroyed and jiho is scared now and brown wants her now but jiho be tripping.