My Charm, Your Karma

Michelle, the real daughter, reunited with her birth parents, but they only favored the fake daughter. She pleased her family, hoping to be loved, but all she got was neglect and ridicule. Eventually, she died of a terminal illness. Upon rebirth, she obtains the “Luck” system and decides to stay away from them and her fiancé to complete the system's tasks and live! But her first task is to approach the bad-tempered heir of the Fu family and become his friend?!

(Source: WebComics)

*Note: Includes two extra chapters.*