Big princess and the court sentenced Yin Daheng to send someone to assassinate Yi for the benefit of consorts. Ali, the witch, was hunted for witnessing the whole process of Yi's murder. Big princess planted Ali, and sent officers and men to search for Ali in the whole city, so as to avoid the revelation. Ali jumped off the cliff, and thanks to the help of his wife Xu, he entered the city safely.
Ali thanked Mrs. Xu for her help, saw that the girl in Mrs. Xu's belly was "Han Yueer" and vowed to protect the child in return. However, after Ali was arrested, she expected that her time was running out, so she entrusted her friend Zhang Luying to protect the "Korean Moon" for her. If she was close to the "Korean Day", it would be destroyed.
In the end, Ali was fined a car. Before he died, he saw the fate of two suns and 1 moon. Moreover, the Xu family gave birth to a girl named Yanyu.
13 years later, Yu Yan and his mother entered the palace to attend the first prize awarding ceremony of his brother Yan Xu. Prince Li Xuan disguised himself in the Hidden Moon Pavilion and sneaked out of the palace to find his brother Yang Mingjun. Chasing butterflies came to the Hidden Moon Pavilion, and met Xuan who had climbed over the wall. Declare love at first sight.
In order to conceal his identity, Xuan lied that his brother was the top scholar 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 his identity.
Yang Ming, who traveled around, met a swindler gang, followed by a national witch, Zhang Luying. Zhang Luying saw that Yang Ming was another "Korean sun", and Yu Yan guessed the identity of Xuanshizi, so he was glad that he would never see him again. Xuan loses sleep at night because he is preoccupied with meeting misty rain during the day. When he was distracted, he accidentally saw a red umbrella hanging in the air. He was glad that maybe God would let him meet misty rain again.
The king consulted with his ministers, and finally Yan Xu became the prince's teacher. Xuan was very dissatisfied when he found that the new teacher was actually inflamed in class. She thought that Yan Cai 17 years old was a lecturer of the prince. She must depend 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 successfully persuaded Xuan with a riddle. Xuan formally worshipped Yan as a teacher and put down a banquet to continue to associate with Yan. During the dinner, Xuan knew that Yan's sister had helped Yan and was 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 the paper to write the introspection book. Yanyu met Yangming and went to the greenhouse to shelter from the rain. Yu Yan advised Yangming to enter the palace more often, which evoked unpleasant memories of Yangming's childhood.
The snow accidentally hit Baojing while the iron was hot, soiling Baojing's clothes and making Baojing unhappy. Baojing's mother dropped her wallet and thought it was Xue who stole it. Baojing 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 the words clashed and broke up in discord.
Yan brought Xuan misty rain in return, and Xuan took the opportunity to ask Yan misty rain. Yan said that Yanyu likes reading, which made Xuan sigh that Yanyu is too far away from her sister princess. After reading the book of introspection written by himself, his writing style and talent made Xuan more obsessed with it. Hua Lian asked Qi Weiwang to learn from Xuan, but Qi Weiwang refused.
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 Ting. Zhang Luying, a witch who entered the palace on orders from big princess, happened to meet misty rain and Baojing at the palace gate. She was very surprised to see that they were all "the Moon of Korea".