Thirty years ago, a young swordsman suddenly appeared in the martial world, wielding a strange broken saber. He defeated the leaders of all the major martial sects in succession, then vanished without a trace. No one knew his name. They only knew that his broken saber was called Sunset. Ten years later, Mu Li, hailed as the Divine General Who Protected the Nation, raised an army in rebellion and marched all the way to the Imperial City. To everyone's surprise, people from the martial world spontaneously came to the emperor's aid, and together they successfully put down the rebellion.
Now, thirty years later, corrupt ministers wreak havoc at court. The eunuch Li Qingyi has seized power and claims that the martial world has long harbored rebellious intentions. He therefore established the Blood-Robed Divine Cult to persecute martial artists, forcing them to retreat into the mountains. Meanwhile, in the desert, a young man appears in the martial world once more, gripping a broken saber... One by one, the secrets of that time will finally come to light.