False Heiress, True Phoenix

Yun Fu (Afu) is adopted by the wealthy Song family, then poisoned by her own sister's jealousy. Both sisters are reborn at the moment of the adoption: Yun Fu lets her sister enter the Song household while she herself finds genuine affection in the Yun family. Step by step she protects her family and counters deadly schemes, and her feelings gradually grow for Qi Junye, her nemesis from her previous life. In the end she defeats her sister and finds happiness.