This wasn't entirely impossible.
Casio had an unexpected encounter, others might have the same. The history of this world was long, and there were even mysterious and powerful civilizations in the distant past. Just like Feng Liusi accidentally obtained the South Dipper Red Vulture Fist in the Roca Mountain Range, lucky fellows were never in short supply.
Maybe Xiadu really was as he had imagined.
However, Casio was still exceptional. The unexpected encounters of others were unpredictable, but he could control his own.
Traveling back to different eras, he explored and discovered with purpose. Even if he failed, it was just a retrospection failure.
It did not jeopardize his life in the real world.
"Xiadu... Xiadu..."
