太子兄長蒙冤、母后入冷宮，云初雪遭未婚夫背叛，遂以婚約換皇商裴沐時救兄。交易漸生真心，他竟藏著帝王忌憚的身份，究竟誰高攀了誰？

The Crown Prince's elder brother was wrongly accused and his mother was sent to a cold palace. Yun Chuxue was betrayed by her fianc é, so she exchanged her engagement for the help of the imperial merchant Pei Mushi to save her brother. As the transaction grew more sincere, he concealed the identity that the emperor feared. Who had climbed higher than whom?