As Hongjun, I Teach the Ancients to Cultivate Immortality, and It Makes Perfect Sense

In the future, extraterrestrial demons invade Earth. Although spiritual qi revival begins, humanity still can't stop their advance. The only solution is to change the past and hasten the arrival of spiritual qi revival. Thus, Li Hongjun, a young man favored by the Heavenly Dao, becomes host to a System. Through one secret realm after another, he leads people from the past toward spiritual qi revival, step by step. Only the emperors, all rebellious to the core, don't seem particularly cooperative. “Rule by the Mandate of Heaven? Fine. Get down on your knees, and I'll crown you myself.” “Divine authority hinders social progress? If I were an ordinary person, I'd agree with you. But I'm sorry, I am a god, so I'll smash your head in.” As the incarnation of the Heavenly Dao, Li Hongjun unwittingly becomes the divine authority opposing imperial rule, embarking on a cultivation journey of love and strife with the emperors. (The protagonist absolutely will not suck up to emperors. Most emperors oppose him. The focus is on spiritual qi revival, not on historical accuracy.)