In the Daliang Kingdom, Gu Qingshuang, the legitimate daughter of the powerful Duke of Zhenguo, and Xiao Jingheng, the youngest but coldest king of the current dynasty with a different surname, have always been incompatible. One is a strategist, the other has great military exploits. On the surface, the two respect each other like guests, but secretly they fight to the death. They are mortal enemies known to everyone in the capital.
However, a ridiculous imperial edict of marriage forcibly bound these mortal enemies. On the wedding night, Xiao Jingheng unexpectedly lost his memory, forgetting the past and his grudges with Gu Qingshuang. After losing his memory, his temperament changed drastically, from a cold-faced Yama to a clingy and sweet husband. He obeyed Gu Qingshuang's words and doted on her, and even regarded her as the treasure in his hand and the darling of his heart.
Gu Qingshuang originally wanted to use Xiao Jingheng's amnesia to get out of the predicament completely, and even took the opportunity to bring down this former enemy. Unexpectedly, as they get along with each other day by day, she discovers that this amnesiac "darling" seems to be more dangerous than when he is awake. He seems innocent and harmless, but in fact he is careful at every step and quietly brings her into his protective circle. And she, too, gradually fell under his clumsy but sincere love.
The situation in the capital is treacherous, and undercurrents are surging inside and outside the court. When Xiao Jingheng's memory gradually recovers, and when the buried conspiracy and old grudges surface, how will this "fake couple" face it? Former rivals, now pillowmates, is their love destined to be a bad fate, or is it a true love that has endured hardships? Can Gu Qingshuang protect this hard-won "favor" in the face of many crises, uncover the truth, and stand side by side with him?
