The two countries of Sheng and Yu went to war, and Sheng was defeated. Princess Sheng was assassinated on her way to a marriage. Before her death, her personal doctor A Yue (played by Xiao Dou Hua) was entrusted by the princess to pretend to be Princess Sheng Le Ling of Sheng to continue the mission of stealing the secret city defense map of Yu. The bizarre death of Concubine Yu of Yu made Chu Ruheng (played by Wang Haoxuan), the third prince of Yu, bear the infamy of "the rebellious son who caused his mother to die of anger". Chu Ruheng did everything he could to find out the truth about his mother's death. The "fake princess who was an orphan of war" met the "real prince who was a rebellious son in the prosperous times". In the deep palace full of turmoil, for the sake of love and peace, the two worked together to resolve the dangers around them, killing each other, loving each other, doubting each other and relying on each other.