The FMC is very neglected by her family/siblings The FMC has some sort of some illness/ time-limit. However, the male MC’s parents and sister are most likely regressors and love her. They also beat up the male MC when he makes some blunders after she arrives. The MMC’s parents help make sure the engagement happens and bring her up to their territory and shower her with love. Please let me know if this sounds familiar!
Hi hi~ I think it may be: Life on the Flower Road of the Grand Duchess
And here's the link:
https://www.mangago.zone/read-manga/life_on_the_flower_road_of_the_grand_duchess/
It’s been awhile since I remember. Romantic fantasy. I remember there being two sisters and they are actually supportive of eachother. The one is special (can’t remember why) so the parents and other dote on her more than our MC but are not abusive. The sister I think may be either isekai or reincarnated so really tries to support MC. The parents just have poor communication skills. She likes the ML but comes to the wrong conclusion that he likes the sister and leaves the house. There’s something significant about shoes. The Mc either develops and gifts a special shoe or get gifted the shoes.