Rebirth: Underworld Boss Training System

The former underworld boss was killed by his subordinates, and was reborn in the body of a fat loser student who was given a system to develop a gangster. In order to find his murderer and avenge himself, the gangster decided to use the body of the wasted student to upgrade in a low-key manner while tracking down his murderer and rushing back to the top of the underworld. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.