Strength Is the Last Word

The protagonist is not a fresh-faced character, he is not useless, and he is not bloody. . . . . . An ordinary young office worker accidentally traveled to the world of immortality, where he was both good and evil. . After reading a lot of books, it turns out that many authors have good backgrounds and subject matter, but the logic is too confusing and I can't read them. Just try to write it yourself once.