I Have Dual Rebirth and Leveling Systems

Although the protagonist Qiao Yifan can force JOJO, there are no ripples or substitutes here, only those with natural abilities. Qiao Yifan was born with level E, the worst ability, and he was able to turn over after acquiring two systems. Can't beat anyone? Kill monsters and upgrade! Beaten to death by a monster? Preserve attributes and rebirth! With both systems in hand, there is no obstacle that cannot be overcome. "Although I, Qiao Yifan, am only E-class now, sooner or later I will become S-class!"