The regent Gu Yanzhi has a secret: he is afraid of suffering. Because he was in the cold palace when he was young, he lacked clothes and medicine, and the root of the disease came down. He also hated the bitterness of all soups and medicines. The "little mute" Shen Yunqing, who came from a medical family, was sent to the palace as a "humanoid medical classic" by his family, but he was actually a hostage. At first, Gu Yanzhi only regarded him as a rare medicinal plant that needed to be carefully guarded, until he discovered that this young man could always "happen" to put a plate of sweet honey-pickled plums or a cup of warm sweet-scented osmanthus wine on his desk when serving medicine. The decoction is no longer difficult to swallow. He began to indulge Shen Yunqing in "trespassing" into the study. Next to the mountains of official documents, the young man quietly read through medical texts, occasionally raising his hand to massage his painful forehead. During the storm in the court, Gu Yanzhi used himself as a shield to block all the open and hidden arrows for him, and only turned the backyard of the palace into a herb garden for him to roam. Later, when Gu Yanzhi cleared all the obstacles and the Shen family wanted to take back their legitimate son, the always gentle and elegant prince tore up the memorial in front of the court, and in front of everyone, gently inserted a jade hairpin symbolizing the identity of the princess into Shen Yunqing's hair.