MC gets put into a story where she's the long-lost daughter of a wealthy family. The ML lived in the village she grew up in, was her boyfriend, and hates her because of the way they broke up. Her biological sister forces her to rejoin the family by threatening to harm her adoptive parents, and likes the (now popular and successful) ML. I was reading this some time ago and set it aside to wait for more chapters, then forgot the title Help please!