https://www.webnovel.com/book/gray-rogue_20053596205901005
Title: Gray Rogue
Genre: Isekai, Action, Weak-to-Strong
Synopsis:
A 27-year-old man deep in debt died protecting a little child from predators. For unknown reasons, he reincarnated in a world similar but not entirely the same as his previous one. Reborn in a peaceful village with the name of Luka, he explores this new world with great curiosity. But the world isn't so nice to its inhabitants, and Luka will realize that fact the hard way.