Sun Bancheng, a wealthy man, met a crying woman on the way back from a brothel. Curiosity made him flirt with her, but he was deceived by someone else and lost his mind. He remained unconscious. The Sun family invited Zhang Jiudao and his two apprentices. Zhang Jiudao's apprentice Dong Xiaobao was only interested in profit. After seeing the generous spending of the Sun family, he decided to take over without authorization. Zhang Jiudao had no choice but to agree to help the Sun family. Unexpectedly, when they cast a spell, they touched Wu Yuanshu's magic circle, which was noticed by Wu Yuanshu. The two sides fought in the air and ended up in a draw. In order to find out the other party's identity, Zhang Jiudao asked Feng Xiaodao and Dong Xiaobao to lurk in the brothel and gambling house in the city. Feng Xiaodao also met Xiu'er, a prostitute in the brothel, and fell in love with her.