Maomao lived a peaceful life with her apothecary father. Until one day, she's sold as a lowly servant to the emperor's palace. But she wasn't meant for a compliant life among royalty. So when imperial heirs fall ill, she decides to step in and find a cure! This catches the eye of Jinshi, a handsome palace official who promotes her. Now, she's making a name for herself solving medical mysteries!
A discussion with Lihaku about recent events leads Maomao to realize that the mysteries she's helped to solve are connected. As the final piece of the puzzle falls into place, she rushes to stop impending disaster.