Huang Minglin, who possesses a mysterious forehead mark (kaden) capable of purifying poison, accidentally reveals her power to Emperor Qing Yongxiang. As a result, she is forced to serve as his poison taster while posing as his favorite concubine. In reality, Minglin is a reincarnated soul who knows that this is the world of a Chinese-style Fantasy novel. In the original story, her "fave" (Oshi)—the Emperor and his Empress—are destined to be killed by the Empress Dowager, the story's protagonist. Determined to protect their happiness, Minglin enters the inner palace, but... no matter how much time passes, the Empress never appears, and Yongxiang begins to truly dote on Minglin, who was supposed to be just a poison taster!? Furthermore, the traps set by the Empress Dowager, who seeks to overthrow Yongxiang, begin to corner them both—. The curtain rises on a rear palace story where a reincarnated consort and a complicated Emperor find their hearts entwined!