Northern barbarian iron cavalry are pressing at the border, and the imperial court faces internal and external troubles. The three members of the Zhenguo Marquis's Mansion unexpectedly bind to a misplaced system. Daughter Fu Jinghong takes charge of the three armies, older brother Fu Chenhan assists the crown prince, and father Fu Qianqiu holds down the imperial court. Facing corruption, conspiracies, and the fires of war, they go from being busy and chaotic to working with one heart, using courage to break through predicaments and wisdom to guard the rivers and mountains, ultimately protecting the peace of the common people and keeping Da Zhou safe.