When a leftover girl in a modern city is about to run away, her soul travels back to ancient times and possesses a princess who was entrusted to a nunnery since she was a child and is about to die due to illness. The princess's condition suddenly improves and her temperament changes drastically. She disguised herself as a man and sneaked into the casino, but lost everything. She had no choice but to work as a kitchen handyman in the prince's palace. She was recognized by the young prince for her intelligence and was promoted as a personal servant. She pretended to be a man and encountered many embarrassing incidents with the young prince. Fortunately, she had thirty years of leftover female skills and continued to pretend without blushing, but she didn't expect that the young prince had been attracted by "his" strange behavior. . . . . .