Regret

(the brother)
The brother lets his sister rot and starve with her maid for years until he decides he doesn't hate her anymore. Man is shocked that the sister he very openly and verbally hated doesn't run into his arms with a big smile.

MC used to live with her abusive father and 2 brothers before she reincarnated into an Otoge with the same family dynamic. She simply makes them feel like shit for how they've treated her. The ML is a very supportive and loving man, kinda. I've read the spoilers and the revenge is sooo satisfying.

Successful girlboss FL possesses a villainess who pines after her cheating prince fiancee. She decides to dump him, take back every single penny she gave to him and enjoy her loving daddy's riches. OGFL used to mingle with the MLs and use them for her antics but MLs learn the truth and regret helping her defeat our QWEENNN

ML is extremely traumatized. He likes teasing and bullying MC because it helps him get distracted form his fucked up mind. He absolutely hates how he was mean to MC and hates himself for being a loser who can't be an ideal boyfriend. Even he is confused why MC would even spare him a glance. The first 5 pages were torture tho. It's one of my new fave to torture myself.