He dies by accident while in the Taoist world of his dreams. But during his subsequent trips through dream worlds, he receives Laozi's legacy and learns that these dream worlds are merely experimental grounds where great sages fight against other worlds.
Worlds covered so far: the Taoist world, the post-apocalyptic world, the Witcher world, and the Three Kingdoms world. Currently writing the imperial dynasty world, with the xianxia, Journey to the West, and Investiture of the Gods worlds planned next.
This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.
I think the author can clearly state the genre in the introduction, whether it is just a false dream, or a time travel in a dream, etc.