该故事就是始于江南翠竹镇上，镇上有户孟家其女孟丽君聪明绝顶，喜作男装打扮瞒其父孟士元在外求学，结交朋友。机缘巧合下男装的丽君结识微服下江南的王孙铁穆耳及忠直少年皇甫少华，三人从此结下不解缘。而丽君早被某人笛声打动，误以为吹笛人是铁穆耳，由此芳心暗许。

Man Si-Yuen is an educated man who used to be an imperial physician; he is old-fashioned and he believes that girls should stay home. In order to study, his daughter Mang Lai-Kwan dresses up like a boy to attend school. There she meets an incognito Mongolian prince, Temür Khan (Tit Muk-Yi), and an upright man named Wongfu Siu-Wah. Lai-Kwan like Muk-Yi, who sees through her female identity. Yet on the other hand, she finds out that Siu-Wah is, in fact, her proposed fiancé. Through a variety of adventurous situations, Lai-Kwan's feelings slowly develop for both Muk-Yi and Siu-Wah.