In My Previous Life, I Was a Swordsman, and I Exchanged Lives with a Female Devil.

Bai Zhanchen was originally the leader of the righteous sword sect. During the battle to eliminate demons, he fought with the demonic saint Ye Yunxi and eventually died together. When his soul died, he accidentally traveled into the body of a girl from five hundred years ago - it turned out to be Ye Yunxi before he fell into the devil's path. Bai Zhanchen was determined to change this girl's tragic fate so that she would no longer fall into the devil's path. On the other side of the world, the witch Ye Yunxi looked at the strange yet familiar face in the mirror - Bai Zhanchen, the best swordsman in the world who killed her in the previous life, and couldn't help but fall into deep thought.