If there is another people's child who got your parents' attention that you always wanted, wouldn't you hate that kid too? And it's not like the black haired guy always cruel, after he grew up he did good things for the FL too without the FL knowing
That might justify his character to us as the readers but not to her who have suffered all these hardships because of him and its better to help someone and let them know about it so that they know that someone is by their side. Honestly she is very strong mentally if it would have been me the amount of trauma that i would have accumulate would have been astronomical
WTF IS THE BLACK HAIRED GUY THE ML? HES SELFISH TRASH! HE ONLY THINKS ABOUT HIS SELF AND HOW HE FEELS. I FKIN HATE HIM AND THE BLONDE MANIPULATIVE ASSHOLE TOO AND OFCOURSE THAT RED HAIRED BTCHHH FKIN BTCH DIE