Hangzhu, the daughter of a guilty minister, entered the palace to find her missing brother and was accidentally pushed to be the nanny of the seventh prince in the cold palace. At this time, she was already pregnant with her deceased husband's son. During her three years in the cold palace, she used folk wisdom to protect Quchen from being poisoned, frozen and starved, and discovered that although the prince was frail, he was extremely talented. During a palace banquet, she arranged for Quchen to show off his talent for photographic memory, attracting the emperor's attention, but was also feared by the Queen Mother.
Linzhu incarnates as "Enlightenment Aunt", teaching the prince how to read and write during the day. At night, she uses her arithmetic and strategy skills to teach the emperor secretly, and uses "folk allusions" to solve the confusion in the court. While she was hiding her pregnancy and dealing with the eunuchs in the cold palace and the spies of her relatives, she was helping Qin Chen keep a low profile in the battle between the princes. When his brother's trace overlapped with the truth about the witchcraft case, Linzhu decided to use Quchen's power to take revenge, and eventually assisted the abandoned son of the former cold palace to ascend the throne. She also transformed from a wet nurse to a behind-the-scenes emperor, exposing her relatives' conspiracy, allowing mother and son to stand on the top of power.
