Xie Yi turned into Xuan Zhen, and then went back to the story of Gu Jian Er.
This idea has been posted on the trumpet before. You can find the first chapter by looking for Yongye. It is really my trumpet and is not plagiarism. There have been a lot of things going on lately, and my mind has been a little confused. I found this out of my previous thoughts and updated it slowly.