During the peaceful Daming Dynasty, Yuan Mo, a commoner from Changle City, encounters A Shu, a refugee from Yanle Kingdom attempting to sneak in at the city gates. This conflict leads to Wang Kunwu being punished for failing to oversee his duties as a border general. As a consequence, Yuan Mo is inadvertently pulled into the Four Square Pavilion, where he forms a team with A Shu, Wang Kunwu, and Yuchi Hua. Together, they confront complex diplomatic challenges in their quest for justice and patriotism.