The thousand-year tribulation is upon us, and a Saint King appears once in an age.
Martial arts champion Lu Fan transmigrates into the body of the naturally dim-witted young master of Ziyun Town. He discovers that this Lu Fan, unable to cultivate because he lacks a spiritual root, was actually born with a Mahayana physique. Taking an unconventional path, Lu Fan enters the Dao through martial arts. He draws in immortal essence, absorbs demonic energy, undergoes trials in the mortal realm, and tempers his sacred body by surviving the Mahayana lightning tribulation.
But with the Saint King revealed, the tribulation arrives. A cataclysmic thousand-year tribulation descends, and Lu Fan, bearing the fate of the Three Realms, can only fight to the death!