Fong Tong Kan & Yin Ji Ma(1956)

Jing meets Hu Yanjuan, a woman who sells medicine, and gets mocked by her. Seeking revenge, he tricks her father and switches their medicine with rocks, causing them to be stopped from selling it. Yanjuan investigates and discovers Jing's deception. Jing pretends to ask her to teach him martial arts, and she uses this opportunity to teach him a lesson.