Douluo Shocked the World

What will happen when the shocking fruit of One Piece comes to the world of Douluo? How can a hard-working wage earner who works after graduating from junior high school counterattack the protagonist in the early stage without being too exaggerated? Slowly increase his own strength. No talent. No problem. There is a sign-in system. Fighting skills are not good. There is a system. No girls. No problem. There is a system. Not too stud. Not many emotional scenes. Just a few. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.