Xiao Yun, the daughter of the Minister of Rites, refused to marry the royal family and was forced to sign a three-year trial marriage contract and temporarily live in Prince Fu's Mansion. The laws of Dayong allowed aristocratic women to have trial marriages, and they could withdraw after three years without damaging their reputation. She has a cold face, but hides the kindness of a doctor in her heart, secretly helping countless orphans.
The crown prince, Forte, appears to be a playboy, but in fact he is in charge of the secret guard and hides his edge. The two met tit-for-tat when they first met, and each had temptations under the contract. She checked his true nature, and he protected her; she set up a trap to test him, but he quietly resolved it.
When a border war breaks out, she delivers medicine to save the people but is framed and reviled throughout the city. He knelt in the palace to vouch for his official career, and overturned the case to prove his innocence. An unjust case of collaborating with the enemy tore through the disguise and ignited the heartbeat.
From guarding against each other to working together to govern, she participated in reforms and he fully supported them. When the contract was invalidated and she sincerely promised, she stood in the court: "I want to make sure that there will no longer be a home broken by the plague in the world."
