Warm and Nourish a Piece of Immortal Land: I Am Cultivating Immortality in the Slow Time

The protagonist is a time traveler, as if he has never seen a woman before, and other aspects of the design are unreasonable. The protagonist says he is Gou, but it is actually quite high-profile. If someone had looked into it, they would have done it long ago.

It's a good mind-training book

There is no female protagonist, and there is also no male protagonist.

Looks good haha