During his conversation with the butler Zhao Qing,
Han Dong and Swollen Doctor gained a preliminary understanding of the "Tomb World."
They first discussed the concept of "Floating Island," which, as the name implies, is an island floating in the air, but the principle of its floating remains unknown.
The village and the grave mountain where Han Dong awoke were both located on a Floating Island, and there are countless other similar islands... this was just a small, even tiny Floating Island.
However, the butler did not know the condition outside the Floating Island.
According to him, any person who knew the outside world was no longer here.
And the only way to the outside world was the "Dragon Boat."