One of the Twin Loves

In the six realms, the heaven and the earth are independent of each other and are evenly matched. The kings of each alien realm want to unite the six realms into one. The protagonists are the two twins who were born into the demon clan, the elder sister Sheng Jianqing and the younger sister Sheng Wuluo. It is in this tense and troubled world that is on the verge of breaking out. On the surface, it is as calm as water, but on the inside, there are undercurrents surging. Everyone is driven by their own interests, and the competition for interests begins. How will the two sisters survive? I don't know whether you are an evil spirit with sunshine in the darkness, or a good spirit with darkness in the prosperous times.