Modern secret agent Yan Ruyu, after executing a mission, wakes up from sleep to find herself transmigrated into the illegitimate daughter of the Ministry of War vice minister's household, about to marry in place of the legitimate daughter to the Prince of Zhennan Huo Changhe, who is currently being ransacked and exiled. Just as she enters the prince's mansion, the ransacking arrives. Relying on her portable space (capable of storing items and continuously upgrading) and modern knowledge, she protects the elderly and young of the Huo family on the exile road, wits and battles with various factions, and ultimately washes away grievances for the Huo family, establishing a new homeland in the northwest.