She was Ling Xue, the daughter of the current Taifu. She was frail and sick since she was a child. She was under the guidance of an expert. She was sent to Ziyun Villa to be looked after by her friend, the King of Hell. When he was fifteen years old, he brought her back to Kyoto.
By chance, she disguised herself as a man and met the most important man in her life, the third prince Dongfeng Jin, in a brothel. It was said that Dongfeng Jin was the most favored prince in the dynasty. He was extraordinarily handsome. Whether in the court or on the battlefield, he had numerous achievements and made indispensable contributions. He was the beloved man in the hearts of all the women in Kyoto. But she didn't know his identity, so she forcibly rescued the assassin from him, and also took away the most important thing in his life.
Unexpectedly, a marriage gift brought these enemies together. On their wedding night, the two made a black and white promise, in exchange for the most important thing in their lives, to maintain their relationship as husband and wife for a year.
During this year, they went from hating to understanding to unforgettable love.