Nah the mc doesn't know her best friend has feelings for her. I mean she literally can't determine whether Jisoo is flirting with her or beeing friends.
I’m not even considering Jisoo’s feelings on this, i’m talking about the mc’s feelings which we know for sure that SHE likes Jisoo but she continues to fuck Hwayeon knowing that Hwayeon literally hates Jisoo and wants her to stay from her (which she wont do either btw). And about the mc “not knowing” that Hwayeon likes her that’s debatable, the way she behaves and tries to monopolize her, even admitting that she is jealous, one gotta be fucking stupid to not get the hint but then again i don’t really trust the mc to be smart.
The mc is like the worse person ever?? She knows Hwayeon likes her but she likes Jisoo yet instead of drawing the line she continues to lead her on.