Seize the future- reincarnation & villainess things

Some ppl dont like this story once they grow up… i had absolutely no qualms lol. MC enters the body of the original mc’s lil sis and makes it her mission to make sure she finds happiness w/ one of the guys who like her. She succeeds but ends up w/ a similar reverse harem situation. Some say the story feels rushed after it focuses on her romance + the other characters dont feel as developed (which I understand) but there’s tons of unique spins that make the story compelling enough for me so :D