Li Chang'an, a transmigrator, enters a fantasy world where propriety has collapsed and rules are twisted, carrying a blunt Measuring Ruler that symbolizes rules and standards. His path is not to reach the pinnacle of immortal cultivation, but to become a walking "corrector of rules." Using modern principles of the rule of law and management skills, he measures all the injustice in the world and reshapes human order amid amusing escapades.
On the surface, the story is a series of episodic mysteries, reforms, and comic everyday adventures. Beneath that, it continually reflects on what makes order truly effective. Li Chang'an progresses from measuring fairness in "one person, one matter" to measuring the laws of "one city, one country," and ultimately faces the rules of the Heavenly Dao itself, transforming from "the one who wields the ruler" into "the lawgiver."
