Fèi Tiān Lè is a frail, sickly prince and is therefore kept under lock and key by the royal family. One day, however, troops from an enemy empire manage to overrun the country and the entire royal family is executed. Tiān Lè is mistaken for a woman because of his feminine appearance and is to be married to the general as a tribute and concubine. On their wedding night, the prince plans to kill the general. But things turn out differently, and soon their fate is intertwined with an old children's song that prophesies a tragic end for them.