Wen Wan, the daughter of a family with medical skills, encounters the fourth prince Xiao Jingheng disguised as a guard in the imperial garden. The two get to know each other while treating an injured palace maid and leave a deep impression on each other.
Wen Wan discovers Xiao Jingheng's true identity and learns that he suffers from a rare "ice syndrome". She is determined to use family medicine to help him treat his stubborn illness.
During the treatment process, the two got along day and night. Xiao Jingheng was moved by Wen Wan's intelligence and kindness. Wen Wan also admired the prince's talent and ambition, and the two secretly fell in love.
The emperor suddenly decreed that Wen Wan be betrothed to the prince Xiao Jingrui as a pawn for political marriage. At the same time, Xiao Jingheng was sent to the border to quell the rebellion.
Wan was neglected and monitored in the prince's palace, and discovered the prince's affair with Lin Yuerong, the daughter of the prime minister. At the same time, she learned that her father had been framed and imprisoned.
