Song Lan, a fairy born from an Isatis root, who is determined to marry Chu Zhimo, the King of Medicine, to complete her immortal cultivation. After being accidentally swallowed by a princess, Song Lan must absorb Chu Zhimo's medicinal energy to escape. Despite his indifference, Song Lan stubbornly pursues him, enlisting the help of her fairy friends—a ginseng doll, a sultry saffron, and a righteous angelica herb—to achieve her bold quest for love.