One overtime night, a cup of coffee spills across her keyboard, and modern office drone Lin Yufei transmigrates straight into the body of the lowest-ranking palace maid, assigned to sweep and clean! She has barely gotten used to her coarse clothes when she runs into an emperor who looks exactly like her own boss, the man who “squeezed every last drop of work” out of his employees. Her broom drops from her hands in shock. Determined to confront her “boss,” she takes on the palace survival challenge: she sorts the storeroom with a garbage-recycling system, impresses the Laundry Bureau with her detergent recipe, makes the emperor see her in a new light with a mind map, and even calls him “Mr. Zhang” in private, only to get caught red-handed. From palace maid to empress, she uses modern slang to turn the palace upside down, but the gap between their stations also brings heartbreak and a painful breakup. When the emperor known as “Mr. Zhang” begins his long quest to win her back, just how many hilarious and heartwarming sparks will fly in this workplace romance between boss and subordinate that crosses time and space?