What would the world be like if it were actually flat and not round?

I have no idea. I assume anything going past the point of no return would end up falling off the side of the Earth and into its orbit... of course, the idea is incomprehensible for me and probably for most people, unless they have some damn incredible imagination. xD

there would be no time paradox...either it would always be 日 或者 night...
and if we walked too far, we would fall off the earth