Time-travel flow + copy flow (non-shuangwen)
ps. This book was dreamed up by the author before, so he integrated a little logic to write this book.
The protagonist Cao Yanyu lives in a world saved by Ultraman Dyna, so he admires Ultraman very much. One day, his world is invaded again, and he actually travels to the world in "The Legend of Ultraman". However, this world is very different...
