In order to avenge her family, Lan Yuan entered the palace and became a palace maid in the imperial kitchen. She used her ancestral cooking skills and medicinal knowledge to design delicious dishes to attract the emperor's attention. She secretly searched ancient books to refine chronic poisons, and gradually eroded the emperor's dragon body by serving meals. At the same time, she used the meal exchanges to get to know the chamberlains and imperial doctors, and weave an intelligence network. It was found out that the orphan of the former empress was secretly raised in the cold palace; she pretended to seek refuge with her beloved concubine, and set up a trap to provoke an internal fight in the harem to gain a promotion opportunity for herself; when the emperor was in danger, she lured the prince into the game in the name of offering food, and used a false imperial edict to support the youngest son born in the cold palace to ascend the throne, and she took control of the court situation as the queen mother.