Global Dungeons? I'm the Final BOSS!

Ye Mo transmigrates into a world of global dungeons, where he lives as a failed examinee with no prospects. Each night, he dreams of becoming a world-destroying Demon God, until he discovers those dreams are real. When a Saintess returns from a dungeon bearing a mysterious mark left by him, one that grants overwhelming power at a terrible cost, the line between dreams and reality begins to collapse, binding their fates together.