So TLC will return...

In the final episode TLC said two things about his future: 

1. He told YQYY that the next time they meet, YQYY will be a mortal in the Divine Continent.

2. When he reversed time, he said his friends will have a better life, but he will not be there with them.

To me this seeming contradiction means that he will not be there in that iteration of the unfoldment of events that we see at the end of the episode. But there will be another iteration, where he will be there along with the then mortal YQYY.