A modern heroine accidentally time-travels and becomes Consort Hu of the Northern Wei inner palace, having just given birth to the palace's only imperial prince. She knows well the cruel Northern Wei ancestral custom of executing the mother when her son is named heir, and realizes that once her son is designated, her life will be in extreme peril, subsequently experiencing the alienation of mother and son and ultimately her tragic fate of being thrown into the Yellow River by Erzhu Rong. The joyous news of the imperial son being named heir spreads throughout the palace, but to the time-traveling Consort Hu, this supreme favor is not wealth, but a lethal blade hanging over her head. The emperor is filled with joy, yet unaware that the inner palace woman is alone bearing the fear of a future destined death; a game of wits surrounding imperial power and the lives of mother and son begins from this moment.