reincarnation

Mc is constantly looking for parental love.
From the father who raised her,
To her biological mother who swapped her,
To her biological father who created her.
All of them have disappointed her, she is tired and just wants to be on her own ready to leave her adoptive dad after his bio daughter is brought back to him.

Originally mc's sister was supposed to marry the ml then die for ml to then be filled with nothing but grief until the og fl comes along and "fixes" him. To save her sister from dying for a plot device, mc ends up marrying ml instead