A car accident transmigrates Mu Sisi and Gu Huai, whom she has only just met, to the Kingdom of Nanyue. Mu Sisi's soul enters the body of Nanyue's princess, Nan Si. Learning that Princess Nan Si was attacked in the street on the day of the Mid-Autumn Festival, she joins forces with Gu Huai to uncover the truth. But endless plots and schemes come to light. What bloody turmoil awaits them...