The Fusang people and Xinluo people in Chaosang Subcontinent were always opponents. Although living in the same subcontinent, the two people had their own countries, which were incompatible as fire and water. They used to fight each other from time to time. In the almost 1 millennium from the age before the Catastrophe to the present, the two human races had never been in peaceful co-existence. Even though Zhang Tie didn't know the reason.
Except for one commonplace, namely, the two people always called themselves the descendants of Hua people in Taixia Country even though they belittled and attacked each other. They both wanted to return to Taixia Country to gain the official approval of Taixia Country.