Wandering Through Ten Thousand Worlds, I Break Through Otherworlds With My Imagination

The protagonist, Su Yu, transmigrates back to his high school days, bringing along a Daydream System. Every time he zones out, he earns Daydream Points. The System's arrival also brings invaders from other worlds: supernatural beasts, parasites, monsters, zombies, demons, angels, and the Divine Court. There are also mysterious demon-seers. As monsters from different worlds invade, Su Yu fights again and again, gradually uncovering the truth about the world. It turns out this place isn't...