Yellow sand inexplicably gushes out of a dry well in a luxurious mansion. Chen Chen pours water into it to investigate, only to discover that it unexpectedly connects to an ancient frontier engulfed in the flames of war. The troops commanded by female general Chu Yan are surrounded and pushed to the brink of annihilation. Relying on modern supplies, Chen Chen repeatedly sends food, protective gear, and sound-and-light equipment to help the defenders overcome one crisis after another. As the passage between the two worlds quietly stabilizes, a story of mutual aid across time and space officially begins.