This is a story about the love, hate and sorrow of two lives. Their birth destined to be an impossible pair in this life. She was his purest princess Yun'er. The two originally lived a sweet and happy life. Everything gradually changed after the death of the late emperor and the crown prince Shangguan Yu succeeded to the throne and was named queen. Changes occurred one after another in the palace, and new people entered the palace. The palace is under tight siege, and intrigues are constantly being staged. Due to the fact that Shangguan Yu's real power has not been stabilized not long after he ascended the throne, there were incidents in the previous dynasty, and people's hearts are unpredictable, Shangguan Yu cannot settle down and live his life as he did when he was the prince. As the king of a country, he needs to be strong enough to govern the country and protect the people he wants to protect.