Shen Yifan, a mortal warrior bound by a fleeting hundred-year lifespan, discovers that slaying demons is the key to prolonging his existence in a world where life essence determines martial strength. As he cuts through hordes of ancient creatures with his blade, spreading fear among beings that have walked the earth for millennia, a troubling pattern emerges—each use of his power accelerates his mortality. Driven by this paradox, he turns his gaze toward legend: the divine palace dwelling in the heavens, home to immortal gods who have transcended the ravages of time. Determined to achieve eternal life, Shen Yifan embarks on a celestial quest to petition the heavenly beings for a million years of borrowed time, transforming himself from a fleeting shadow into an immortal force that will span the ages.