After waking up, modern girl Song Su unexpectedly finds herself transported to ancient times, where she becomes the heir of the Marquis of Wu'an household, a young nobleman who disguises herself as a man. Her father is the powerful Marquis of Wu'an, who commands the military, and her mother is a first-rank titled noblewoman. She originally hopes to live a peaceful life, but her unfamiliarity with court etiquette leads to one hilarious mishap after another. With her quick wit and sincerity, she clears up misunderstandings and makes friends, while the composed Emperor Pei Huaizhen gradually begins to see this extraordinary young heir in a different light. Thus begins a lighthearted, joyful, heartwarming, and healing comedy set in ancient times.