该剧以雍国外交机构“四方馆”为背景，讲述身处这一片小小天地中的元莫（檀健次 饰）、阿术（周依然 饰）、王昆吾（杜淳 饰）、尉迟华（阚清子 饰）等四方志士胸怀理想，为家国和正义勇敢奔赴、砥砺前行的故事。
During the peaceful years of the Daming Dynasty, Yuan Mo, a commoner from Changle City, stands at the city gates issuing permits to foreign visitors, using the Four Square Pavilion's seal. Unexpectedly, he encounters A Shu, a refugee from Yanle Kingdom trying to sneak into the city, which leads to an altercation. This results in the newly arrived border general Wang Kunwu being punished by overseeing duties at the Four Square Pavilion. As a consequence, Yuan Mo is inadvertently pulled into the affairs of the Four Square Pavilion's western office, overseen by Yu De Shui. He becomes a minor official handling various international affairs. Through a series of serendipitous events, A Shu becomes Yuan Mo's "little maidservant," Wang Kunwu becomes his superior, and the formidable Yuchi Hua, a noblewoman with power, joins the mix. Mocked as a "useless" member of the western office, Yuan Mo matures as he navigates through challenging diplomatic matters.
