Douzhan Tianxia (Fighting the World) torrent

The mysterious young man Dafeng rescued Li Huamei, who was seriously ill after being plotted against. Dafeng wanted to go to Kyoto to find his senior sister and happened to be on the same road with Li Huamei. On the way, Li Huamei was shocked to find that her senior sister was the Queen Qin Zhao, and the Queen repeatedly sent assassins to kill her. In order to find out the reason, Dafeng and Li Huamei entrusted their lives to each other and fought against the enemy together. Disputes arose in the rivers and lakes, and the court struggles became more intense. The two were unknowingly involved in a treacherous conspiracy, and Dafeng was the key to solving all the mysteries...

Information:
https://myanimelist.net/anime/60797/Douzhan_Tianxia