Top assassin Gu Qingyan accepts a contract to kill Prince Xiao Yan, but fails in all three of their first encounters. On her fourth attempt, she opens Xiao Yan's robe and sees a body covered in shocking old scars. This prince, mocked by everyone as a carefree wastrel, is actually the Crown Prince who was framed years ago. She lowers her bloodstained dagger and swears a blood alliance with him. But on the eve of their plan's final move, Gu Qingyan discovers that the false imperial edict that destroyed Xiao Yan's family came from her own biological father...
