After experiencing family changes, young man Xu Ning accidentally discovers that the ancestral bronze door connects the modern world and the different realm of Da Zhou while replanning his life. Facing different living environments in the two worlds, he starts from running daily necessities, and gradually builds a new career with diligence, modern knowledge, and integrity. In Da Zhou, he becomes an apprentice to learn martial arts, facing difficulties together with Zhao Lingshuang; in the modern world, classmate Liang Yuxin helps him find sales channels and gives support. As the exchanges between the two realms deepen day by day, Xu Ning constantly encounters new tests and gradually understands the meaning of responsibility and trust.