Modern mooncake streamer Lin Xiaoman, on the eve of being laid off, travels through time to a troubled era, becoming the orphan Zhao Chunniang who is awaiting a redemptive marriage to ward off bad luck. Relying on her skills in making mooncakes and her bookkeeping mind, she establishes herself in the village, opens a pastry workshop, and fights against wicked clans and profiteering merchants. By chance, she saves Xiao Jue, a defeated and wounded general of the Liaoyuan Army, and stands shoulder to shoulder with the failed scholar Zhao Sheng, using mooncakes to transmit intelligence and transport military provisions. After experiencing espionage and the Battle of the Tang River, she helps the righteous army win. When the world is newly settled, Xiaoman is conferred the title of a noble lady of designation, settles accounts with her enemies, rejects the imperial bestowed marriage, and marries Zhao Sheng to stay together. She insists on affordable six-wen-coin mooncakes to benefit the people, eventually the time-travel mark on her wrist dissipates, completing her identity closed loop, and the story concludes among the museum's print mold exhibits.