Crown Prince Xiao Chengji accidentally goes missing, throwing the emperor and empress into a fury as the imperial guards search the entire capital. It turns out that Shen Baoning has taken Xiao Chengji home with her. When the emperor learns the truth, he is furious, but Xiao Chengji voluntarily explains the whole story to the emperor and empress and pleads for Baoning's innocent family. The emperor is left both exasperated and amused. Instead of punishing them, he appoints Baoning as the crown prince's study companion. For the next ten years, Baoning lives in the Eastern Palace, constantly getting into trouble but always being protected by Xiao Chengji. When a black bear appears during the autumn hunt, Baoning bravely steps forward to protect the crown prince. Deeply moved, the emperor adopts her as his goddaughter and grants her the title of Princess Anning. As they grow up together, feelings quietly blossom between them.