Meng Lijun is both smart and well versed in martial arts. To show her skills, she decided to disguise herself as a man to take part in a local competition. However, her father Meng Shiyuan unexpectedly wanted her to accompany him to the hills to collect herbs on the day of the competition. To excuse herself from his company, Lijun asked Shiyuan to solve an extremely difficult chess puzzle while she slipped off for the competition.
Lijun tricked the others into letting her substitute her brother for the competition and helped Dongyue School win. Tie Mu’er and Marco Polo happened to be attracted by the competition and he gave a difficult maths question to test Lijun and she managed to win. Shuyuan punished Lijun by making her stay in her room for tricking him. That night, Lijun was enchanted by the faraway music from a flute.
Using a chess book as bait, Lijun managed to persuade her father to let her attend the town celebrations. At the celebration, Huangpu Shaohua saw a bully Liu Kuibi bullying a pair of performing siblings and taught him a lesson. Lijun wanted to play a trick on Tie Mu’er and snatched his jade in the chaos but Tie Mu’er’s servant, Asang-ge mistook Shaohua to be the thief. Lijun was upset that Tie Mu’er thought of her as a thief so when he came to look for Shiyuan, she identified herself as Shiyuan’s nephew, ‘Wei Ziying’ and made a fool out of him.
Lijun tricked Tier Mu’er into going with her to Baiyun Hill to find Shiyuan, with the intention of making fun of him but her plan backfired and she ended up falling into the mud herself. As Tie Mu’er wanted to seek Shiyuan’s (who used to be an imperial physician during the previous dynasty) help in getting a cure for his asthmatic father, he agreed to Lijun’s demands to book a whole restaurant to apologise to her. However, this offended Liu Kuibi, who wanted to book the same restaurant as well. While his men were fighting, Kuibi tried to secretly attack Lijun but Tie Mu’er helped her. Lijun’s heart began beating wildly when she fell into his arms in the process. When Kuibi’s mother found out about his fight with the Mongolians, she advised him not to antagonize the Mongolians or his father Liu would blame him of he finds out.
Lijun changed her initial impression of Tie Mu’er and her maid Ronglan made fun of her. Shiyuan believed Lijun’s words and went to the hills to look for a certain herb. Lijun then found a ploy to excuse herself from accompanying her mother to the temple and went to enjoy herself while her parents are not in. Lijun bumped into Tie Mu’er at the lantern festival but Shaohua unexpectedly appeared. To prevent the jade incident from being exposed, Lijun turned around to leave. Shaohua and Tie Mu’er were attacked by Kuibi’s men and Lijun returned to help them as she felt that the whole incident was caused by her. Tie, Shaohua, Lijun and Marco Polo then went for a drinking session and became sworn brothers. The drunk Lijun revealed that she is actually a girl but no one paid heed to her. Lijun suddenly heard the flute being played and went to look for the source of the music. She mistakenly thought that Tie is the flutist and took a liking for him.
Kuibi was teasing a girl who was going to become a nun at the temple and later met Lijun’s maid Yingxue at the temple. He was attracted by her but mistook her to be Lijun. Shaohua was playing chess with Tie and Lijun felt that he should not have admitted defeat so easily. She took over the game and managed to win with her brilliant chess skills.