Wo Yang Le Liang Ge Hei Hua Mofashi

A witch found two abandoned kids by accident and adopted them. With time passing by, both kids started to grow feelings for her, which led to a tragedy. Chen Xuanming, the elder one, was incited by a mysterious man to kill his younger brother Dugu Chenfeng, but he got Zhixi, his foster mother, killed by accident. Hundreds of years later, Zhixi's soul awakened in the body of Dugu Chenfeng's ex-wife. Meanwhile, Chen Xuanming also showed up... (Source: Webnovel)