There were originally four major families: Dongfang, Situ, Baili, and Gongyi. Situ framed Gongyi, and the other three families exterminated Gongyi. Gongyi's only bloodline was inadvertently brought into Dongfang. Later, Gongyi's son became close friends with a Situ during his training. In the end, Gongyi's son died under the sword of this Situ in revenge.
Intention: Even though there is hatred, you still become the light in my life