What does the mirror twin cities ending mean?

In the end, sumo sacrificed for Jiao Ren and returned to the blue ocean, and Bai Ying accompanied sumo in Jiao Ren's hometown. But Zhen Lan returned to Kongsang and let Kongsang people live on the ground.

Kong Sang and Jiao Ren will never do this again. Yanxi became a new seafood, and they stayed with Na Sheng. Finally, they gave birth to a child. Although sumo and Bai Ying did not come together in the end, for Bai Ying, she will always accompany sumo.

Bai Ying finally chose sumo, but agreed with Zhen Lan to be together in the next life. As a seafood, the original mission of sumo wrestling is to bring Jiao Ren back to the blue ocean. Kongsang treated Jiao Ren as a slave and persecuted Jiao Ren constantly, which led to Jiao Ren's deep hatred for Kongsang people.

Therefore, when Bai Ying fell in love with sumo, sumo didn't believe it, thinking that Bai Ying just liked his beautiful appearance. But when Bai Ying jumped off the white tower for sumo, sumo knew that Bai Ying really loved him.

Later, after the ice clan defeated Kongsang, they wanted to destroy Kongsang. Finally, Qi Xin Qi Xin, the sixth king of Kongsang, worked together to transfer Kongsang people to underground life. In order to return to the ground, Kongsang and Jiao Ren cooperated again.