This drama tells the story of a prince stationed at the frontier, who received a secret order from the crown prince and rushed to Yuncheng with his cavalry. However, he was ambushed by the secret guards as soon as he arrived at the gate, and was inexplicably accused of treason. After a fierce fight, he finally escaped, but he was turned into a child. As a child with a body of only 10 years old, how can he solve the mystery step by step, and how can he survive the pursuit?