Zhang Xichun's family suffered a devastating upheaval when she was young. Her parents died in an accident on their way back to the capital, and she was separated from her only younger brother for years. After she came of age, Emperor Taizong arranged her marriage to Li Haochi, the deposed crown prince. The couple came to understand and cherish each other, joining hands to defeat one sinister foe after another in the treacherous capital. In the end, they rose to the very pinnacle of power.
But by then, Li Haochi had become emperor and grown suspicious of everyone. The couple gradually drifted apart. Faced with the temptation of power, can they still uphold the vow they once made: to stay together until their hair turns white and share both life and death?
