Modern youth Jiang Yang accidentally crosses into the early Zhenguan period of the Great Tang, becoming a seventh-rank Diarized Official and binding the "Break Defense System". Facing Tujue pressing at the border, imperial clan rebellions, and aristocratic families monopolizing court politics, he relies on sharp tongue and modern knowledge to harvest defense-breaking points, rising all the way from a minor court official. Jiang Yang makes ice and refines sugar, improves farming tools, and promotes the imperial examination, defusing the Great Tang crisis through wave after wave of absurd yet passionate monarch-minister confrontations, and gradually growing from a minor character who only wanted to slack off and make money into a heavyweight official of the state who cares for the common people and assists Li Shimin in creating a prosperous age amidst power games.