Princess An'an, the beloved daughter of Emperor Xiao Lingtian of Great Chu, was born with a red koi-shaped mark between her eyebrows. On the very day she was born, sweet rain fell from the heavens, and she was regarded as an auspicious sign of the nation's destiny. Innocent and naive, she loves nothing more than playing and having fun, yet she always brings unexpected good fortune. The potato seeds she unearths help ease a famine among the people, a chance encounter with a miraculous herb heals the fifth prince's crippled leg, and hidden dangers in the imperial harem and royal court are exposed through her seemingly insignificant little actions, allowing her father and brothers to put everything in order. Ultimately, her extraordinary good fortune helps lead the dynasty into a golden age.