A story that follows a crown prince who faces enemies from all sides and falls in love with a maidservant who wants to kill him. He is a son simply yearning for his father's love but is feared and suppressed due to his position. Despite the conflicts, the Crown Prince is a man willing to sacrifice his life and reputation for his country. Xiao Ding Quan is appointed as the Crown Prince during the fourth year of the King's rule. He solidifies his control in the military through the support of the famous general Gu Si Lin, his uncle from his mother's side. In the political arena, he receives the guidance and advice of the righteous Lu Shi Yu who holds a high position in court. The King views Xiao Ding Quan's merits and alliances as a threat and makes things difficult for him even though Xiao Ding Quan wants nothing more than to be a dutiful son and subordinate to his own father. At the same time, the King turns a blind eye to his illegitimate son Xiao Ding Tang's ambition to take the throne for himself. Xiao Ding Tang conspires to frame Xiao Ding Quan for the death of a civil official named Lu Ying. Lu Ying's daughter Lu Wen Xi assumes a new alias as A Bao and enters the palace as a maidservant in order to get revenge.