
Imma be honest the FL treats the hwiyoung dude like absolute shit.
She's been mean to him so many times and also lied alot.
In the real world, she'd be a piece of shit but since this is a manhwa no one cares.
If he wants to never get back with her (which will never happen) he has all the right and she doesnt even like him

She's a grown woman and these characters are the most shameful things she ever made when she was a teenager, and she just wants to go home. And to go home she has to follow the plot of her cringe webnovel, so that's why she has to lie so much.
So her not liking the ML is understandable, so far the only character she likes is her best friend and her brother (maybe)
In her situation would you an adult (if you're not an adult imagine that you're an adult) actually like one of the most dramatic teenagers to ever exist and know that you have to be forced to date, break up, and date this dramatic teenager?

She's mad (more so upset and annoyed, not really mad) because she's being forced to follow the story but she can't remember it. And the ML getting back with her is the next plot point that will send her home but he's being stubborn, dramatic, and closed off.
Which is still him sticking to the plot but she still has a right to be annoyed. Remember everything that's happened is because she's forced to by the will of the novel
YES BRING ON THE ANGST