Centenary-year-old Su Mu joins the army on behalf of his granddaughter and accidentally unlocks the age-reversing system. The commander-in-chief Xu Shigui was defeated and framed him, and everyone in the court questioned him. The third prince Xiao Jingyu supported him and took care of his granddaughter. Su Mu trained troops to build a special force, developed a Mo Dao that could restrain cavalry, killed Beidi warriors one after another, used a kite trick to break through fortified cities, and defeated killers and hundreds of thousands of enemy troops. He learned the Eighteen Dragon Subduing Palms, killed the King of Beidi in formation, supported the sage foreign leaders to negotiate peace, pacified the northern border, was granted the title of General of the North, and became the centenary war god who protects the country.
