Big princess and the government ordered Yin Daheng to send someone to assassinate Yi for the benefit of consorts. Ali, the witch, was hunted for witnessing the whole murder of Sheng Jun. Big princess planted Ali, and sent officers and men to search for Ali in the city, so as not to expose things. Ali jumped off the cliff, and with the help of his wife Xu, he entered the city safely.
Ali thanked Mrs. Xu for her help and saw that the girl in Mrs. Xu's belly was the "Korean Moon" and vowed to protect the child in return. However, Ali was arrested, and he expected that his time was running out, so he entrusted his good friend Zhang Luying to protect the "Korean Moon" for her. If she approached the "Korean Sun", the moon would be destroyed.
In the end, Ali was fined a car. Before he died, he saw the fate of two suns and 1 moon. And Xu Jiasheng gave birth to a girl named Yanyu.
13 years later, Yu Yan and her mother entered the palace to attend the first prize awarding ceremony of her brother Yan Xu. Prince Li Xuan disguised himself in the Hidden Moon Pavilion and sneaked out of the palace to find his younger brother Yang Mingjun. Looking for butterflies came to the hidden moon pavilion and happened to meet Xuan who came over the wall. Declare love at first sight.
In order to conceal his identity, Xuan lied that his brother was the champion of Wu and was caught by misty rain. In a hurry, Zhong Xuan escaped with misty rain to avoid the imperial army. During the conversation, Yanyu's erudition and unique political insight made Xuan deeply impressed and appreciated Yanyu. Before Yanyu left the palace, Xuan sent someone to give Yanyu a handkerchief to hide her identity.
Yang Ming, who traveled around, met a fraud gang and was followed by the national witch Zhang Luying. Zhang Luying saw that Yang Ming was another "Korean sun" and Yu Yan guessed the identity of Xuan Shizi, so he was glad that he could not meet again in the future. Xuan can't sleep at night because he is absorbed in the encounter with misty rain during the day. When he was distracted, he accidentally saw the red umbrella hanging in the air. He was glad that maybe God would let him meet misty rain again.
The king discussed it with his ministers, and finally Yan Xu became the prince's teacher. Xuan was very dissatisfied when she found out that the new teacher was actually inflammatory in class. She thought that Yan Cai 17 years old was a lecturer of the Prince. She must be very dependent on her sponsor. When she learned that Yan was a lecturer of the Prince, she was very upset. She was worried that Xuan would find out that she was Yan's sister, which was not good for Yan.
Yan succeeded in persuading Xuan with a riddle. Xuan formally worshipped Yan as a teacher and held a banquet to continue his contacts with Yan. At the banquet, Xuan knew that Yan's sister helped Yan and was very curious about Yan's sister. He was very happy when he learned through Hengshan that Yan's sister was Yanyu.
Yanyu and Xue, the maid, went to the streets to choose paper for writing introspection books. Yanyu met Yangming and went to the greenhouse to hide from the rain. Yu Yan suggested that Yangming should visit the palace more, which evoked unpleasant memories of Yangming's childhood.
The snow accidentally hit Baojing while the iron was hot, which stained Baojing's clothes and made Baojing very unhappy. Bao Jing's mother dropped her wallet and thought it was Xue who stole it. Bao Jing found her wallet and pretended not to know to teach Xue a lesson. She acquiesced in taking Xue home and torturing her. In order to find snow, misty rain went to Baojing's house, and there was a conflict between words, which broke up in discord.
Yan brought Xuan Yanyu in return, and Xuan took the opportunity to ask about Yan Yanyu. Yan said that Yanyu likes reading, which makes Xuan sigh that Yanyu is far from her sister Princess. After seeing the self-examination book written by himself, his writing style and talent made Xuan more obsessed with it. She proposed to the king that she wanted to learn Xuan, but she was rejected by the king.
Ministers discussed the possibility of choosing gift children from various families to accompany the princess in her study, and recommended Yin Baojing, the daughter of a government judge, and Xu, the daughter of the museum. Zhang Luying is a witch who entered the palace on the orders of the grand princess. She happened to meet misty rain and precious mirror at the palace gate, and was very surprised to find that they were both "the moon of Korea".