Ao Jiayin is a fifty-year-old dragon cub, the only daughter of the North Sea Dragon King Ao Zhan and the eldest princess of the Phoenix Clan. Despite her young appearance, she possesses immense innate strength and divine bloodline power. Living in the magnificent Dragon Palace, she is a mischievous child who frequently ransacks her father's treasure vaults in search of toys. During one such expedition, she discovers the Realm-Breaking Pearl, a supreme celestial artifact capable of traversing the barriers between worlds. Her father explains that activating the pearl requires accumulating merit by saving or benefiting ten thousand people, a task impossible for a child of her age and capability. Frustrated by his dismissal of her abilities and eager to explore, Jiayin decides to activate the pearl on her own.
Unable to pierce her impenetrable dragon skin with ordinary weapons to draw essence blood, Jiayin resorts to biting her own cheek and spitting blood onto the pearl. The artifact activates instantly, transporting her to the Mortal World of the Great Yan Dynasty. She arrives during a severe drought in Huaiyang Commandery that has persisted for nearly two years. Unaware of the local customs or the fragility of her new environment, her mere presence disrupts the heavenly balance. When she expresses a desire for rain, the heavens respond with a torrential downpour that continues for five days and four nights, transforming the drought into a catastrophic flood.
Jiayin is swept away by the rising waters and found floating by Fang Youwei, a hunter from Fangjia Village who is fleeing the flood with his family. The Fang family, consisting of Fang Youwei, his wife Li, his mother Old Madam Yang, and his young son Fang Zhiyuan, takes pity on the orphaned-looking child and adopts her. Jiayin, unable to access her internal spirit space due to the suppression of the lower plane, relies on the Fang family for survival. She quickly demonstrates her extraordinary strength by snapping thick tree branches with ease and communicates telepathically with animals, taming a wild donkey named Liu Liu who becomes their draft animal.
Through her interactions with the Fang family, Jiayin learns about the mortal world's struggles with famine and disaster. She inadvertently brings rain to stop the floods and helps the family secure food through her ability to command animals and her father's guidance via a mental link through the pearl. Ao Zhan informs her that she can return home once she accumulates sufficient merit, which requires her to read and utilize a exchange system within the pearl. Consequently, Jiayin resolves to learn literacy while navigating the challenges of mortal life, balancing her divine heritage with the humble circumstances of her adopted family. The story follows her growth as she adapts to the Great Yan Dynasty, using her unique abilities to benefit the local populace and accumulate the merit necessary for her eventual return to the Dragon Palace.
