Kang Cheol-gang, raised by his paralyzed father, seeks revenge and heads to the city, only to find it vastly different from what he expected. Tracking down his father’s enemy, Nam In-gyu, he discovers that Nam refuses to fight and warns him to stay away from his son. Ignoring the warning, Cheol-gang battles Nam’s son and, in desperation, takes a mysterious drug that grants him an immortal body. Thus begins his wild, action-packed, and comedic adventure as an unkillable warrior!