Episode 3 recap: Nan Gong Yao visited the Zhong Ji Charity House, while Mei Yu Shan entered the palace to study.

Xiao Dou Zi painstakingly explained the process of their transformation, and the three fathers finally understood. Suddenly, a killer named Xiao Que appeared in the room, taking Xiao Dou Zi hostage and demanding the Moon Spirit Pearl. Xiao Que did not know about the body swap, so Xiao Dou Zi pulled out a jade pendant, saying it was a hundred times more precious than the Moon Spirit Pearl. Xiao Que insisted on only wanting the Moon Spirit Pearl, then threw a smoke bomb and left with the hostage.

The three fathers learned that the one taken hostage was Mei Yu Shan, and they were not angry. However, Xiao Dou Zi was very anxious, feeling responsible if anything happened to Mei Yu Shan, and decided to find a way to rescue him.

To investigate the recent cases of missing women and children, Nan Gong Yao waited in front of the Zhong Ji Charity House. After a while, he had Dong Xi buy two skewers of sugar-coated haws, tie a red string to them, and knock on the door. When the door opened, a man saw the sugary treats and invited Nan Gong Yao's group inside.

The killer Xiao Que, with Xiao Dou Zi in tow, secretly followed Nan Gong Yao into the courtyard, intending to assassinate him. Mei Yu Shan, who was at the back, noticed the door had closed, so he climbed over the wall to enter the courtyard.

Nan Gong Yao, following the manager, found a large number of children dressed as vagrants. The manager explained they were brought in due to a natural disaster, with virtually no family, and could be traded without concern. When Nan Gong Yao asked about official investigation, the manager said the authorities were preoccupied with the influx of disaster victims, and this solved a problem for them.

Nan Gong Yao noticed Mei Yu Shan looking around the courtyard and went to ask him. Mei Yu Shan, not daring to reveal his true intention, suddenly remembered the lost Moon Spirit Pearl and asked Nan Gong Yao if he had seen it.

Nan Gong Yao mentioned his own jade pendant, and Mei Yu Shan tried to use a water bucket to get Nan Gong Yao to take off his clothes and check for the pearl. Xiao Que's throwing darts kept interrupting this attempt. Nan Gong Yao then apprehended Xiao Que.

Nan Bei quickly investigated the Zhong Ji Charity House's shady dealings, which were operating under the guise of official authority with the backing of officials from the Ministry of Personnel. Nan Gong Yao ordered that the group be brought back for prosecution.

Mei Yu Shan secretly wandered around the courtyard and found Xiao Dou Zi locked in a warehouse. The two left the charity house, and Xiao Dou Zi said that the next day was the day for Mei Yu Shan to enter the palace to study. If Mei Yu Shan didn't show up on time, the entire Prime Minister's mansion would be questioned. Since they couldn't swap back, Mei Yu Shan had to take Mei Yu Shan's place and enter the palace to study, with the hope of finding the Moon Spirit Pearl and swapping back.

Xiao Dou Zi offered to disguise himself as a maid and go with Mei Yu Shan to the palace to protect him. The next day, the fake Mei Yu Shan hurriedly said goodbye to the Prime Minister and his wife, leaving behind Cui Cui and rushing to enter the palace. Xiao Dou Zi hid in the carriage, posing as a lady-in-waiting.

Meanwhile, the Crown Prince visited the Tianjin Palace to see his childhood friend, Bai Ye, who was a national astrologer. Bai Ye had long predicted that the Crown Prince would fall in love with Princess Sheng Dong, leading to the downfall of the kingdom - which is why he had been confined to the Tianjin Palace for 16 years.

Upon returning to court, Nan Gong Yao raided the home of the Minister of Personnel, Wang Shu. The Empress Dowager warned Nan Gong Yao not to be too aggressive, so he temporarily set aside court affairs and joined the female students in their palace studies.

Grand Steward Song arranged for the young ladies to wear matching uniforms for their portrait sessions. Only Mei Yu Shan found the student's outfit unfitting, constantly fidgeting and making it difficult for the artist to paint. Xiao Dou Zi then volunteered to paint a portrait of "his mistress" himself.