Yun Shu, a modern forensic doctor, accidentally entered the Yong Dynasty palace and became a fire girl at the bottom of the imperial kitchen in the West Palace. From the beginning, she was treated harshly by the steward, doing heavy work and eating scraps. Her life was like a piece of grass and could be thrown away at any time. In order to protect herself, she restrained her talents and hid her modern knowledge. She relied on basic health knowledge to avoid epidemics, relied on simple nutrition to survive famine, and hunkered down at the bottom.
While foraging for food late at night, she accidentally bumped into the deposed prince Xiao Jin and was chased by assassins. Xiao Jin was stabbed and critically injured, and his loyal old servant struggled to save him. Yun Shu thought of someone who was also in dire straits, and relied on his knowledge of forensic first aid to save people from danger. From then on, he formed a secret alliance with the prince who was falsely accused and deposed and was dormant and gathering strength.
She used modern wisdom to solve the problem: she used innovative meals to amaze the harem and escape from the bottom; she used logical reasoning to expose the palace conspiracy and avoid being framed; she used forensic skills to identify perjury and help Xiao Jin clear his innocence. He was secretly plotting: uniting old troops, rallying military morale, and pacifying the border. He used her knowledge to solve the food and grass crisis and defeat the villain's conspiracy. He gradually showed his talents from the despised prince who everyone despised.
The great disparity in class cannot stop the ambition to work together, and the struggle in the palace will not destroy the original intention. She went from being a maid who was bullied by others, to a queen who could check and balance the harem and assist in governing the world; he went from being a deposed prince who was imprisoned in poverty to becoming a benevolent and iron-blooded emperor who cared about the world. From mutual benefit and win-win to being dependent on each other for life and death, the two work together to eliminate traitors, regulate officials, and bring peace to the people. They eventually build a prosperous Yong Dynasty and guard thousands of miles of rivers and mountains together.