The reclusive prince Xiao Zhen and his wife adopt a baby girl and name her Xiao Ling'er. They dote on her, and she grows up freely and spiritedly at Sunset Manor, getting into all sorts of amusing mischief. She shares a childhood bond with the second prince, Xiao Yu, who comes to the manor to recuperate. When Xiao Yu is sent to Divine Doctor Island for treatment, the two are separated for fifteen years. They eventually reunite in the martial world, where the grown-up Ling'er encounters Xiao Yu after he has changed his appearance. Their mistaken identities lead to a string of misunderstandings. As clues to her birth emerge, Ling'er's true identity is revealed, the constraints of the past are broken, and a warm, moving romance in an ancient-style setting begins.