Teacher Zhu (played by Ng Man-tat) has taught at St. Yu Keung Middle School for fifty years. He is very popular among students of different generations because of his open-minded style and encouragement of students to learn about the relationship between sexes. On the occasion of Teacher Zhu's 80th birthday, several of his students came out to celebrate for him. Among them are the committee member Wu Yuren (played by Eric Tsang), who is tough outside but docile at home, the award-winning actor Zhang Qiuyun (played by Chan Wai-man), the well-known gynecologist Fu Wuchen (played by Wong Jing), the "metaphysical master" Situ Qifeng (played by Chapman To) who is frequently exposed, and the dance teacher Lin Charlie (played by Di Yida). The five people took Teacher Zhu to Jiangmen to celebrate his birthday. They met five young models (played by Chrissie Chau, Yeung Chi-yiu, Xu Zixian, Zhu Yulin, and Jiang Yi) who were taking pictures in the hotel. The six people immediately became aroused. Unexpectedly, Teacher Zhu died of excessive excitement. Before his death, he asked the five people to find pleasure for him. The five students took the order and began to develop extramarital passions with the five young models behind their wives' backs...