Zombie Brother (2013)

Bai Xiaofei lived a dull, boring life. That all changes when, on his way to find his girlfriend, he meets a mutant with unprecedented power. As an ordinary human being, Xiaofei felt totally out of his depth; there was no way he could defeat powerful enemies and track down the cause of these strange mutations. After giving himself a shot of body enhancer bought online, however, he gradually reaches his potential.