The human race is in decline, and demons are keeping all living beings in captivity. Gu Yi traveled through time and became a useless son-in-law on the border of the human race in the wilderness. Although he did not have any talent for cultivation, he possessed top strategic thinking and political wisdom in his previous life. Faced with the pressure of demons and internal strife within the family, he entered the situation with the attitude of "taking advantage of others", but in fact he was strategizing behind the scenes.
He supports his arrogant princess wife who only wants to kill demons but does not know how to maneuver. Externally, he reshapes the human race's combat power through "land reform" and "military reform", and internally cleans up the rotten wood in the court. The couple, one civilized and one martial, one yin and one yang, fought their way back from the border town to the imperial capital, and then declared war on the demon world. In the end, Gu Yi used his mortal body to design a trap to kill the gods, broke the old law of heaven of "the weak and the strong", established a new law of "man can conquer nature", and became the number one imperial master in all eternity.
