A modern Chinese linguistics doctor time-travels to ancient times, becoming Zhang Sanlang, a low-level clerk at the Juancheng County Yamen. After suffering a family cutoff, he single-handedly raises a son and daughter. Upholding public fairness and strictly observing the law, he establishes himself in the yamen through his own knowledge and handling wisdom, carefully sorting and checking tax ledgers, undaunted by the heavy harassment of local forces, steadfastly maintaining his original intention to protect the reasonable rights and interests of the common people, uniting with upright colleagues to crack various dilemmas, fulfilling his duties steadfastly in an ordinary post while balancing family responsibilities, and conveying the positive spirit of valuing virtue, abiding by the law, and practical action with responsibility.