Yan, a genius herbal bath artisan, heals customers with her masterfully blended medicinal hot springs. However, her peaceful life collapses when her uncle steals the bathhouse and sells her off as the 21st concubine of a wealthy man. Just as Yan is about to be forced into marriage, her long-time love and childhood friend Kourai bursts in to rescue her! Thinking they would elope together, Yan is shocked when she is taken not to freedom—but to the Imperial Harem! Loved intensely by her noble childhood friend, Yan begins a new life in the harem, healing the imperial consorts with her medicinal baths and transforming the palace from within. A luxurious, romantic palace drama begins!