A woman named Aunt Liu found out she had AIDS through a medical report, but she couldn't understand how she contracted the disease. So she went to another hospital for a check-up, but the results did not change. Later, she remembered that she had had a relationship with Uncle Chen, who was covered with red rashes, and at that time she did not realize the seriousness of the problem, and now she regretted it.
Aunt Liu is a person who likes to dance in the square, and due to proper maintenance, despite being over half a hundred years old, she still maintains a good figure and has become the darling of her male dance partners. When dancing in the square, there will inevitably be physical contact between her and her male dance partner, and coupled with beautiful music and dim lighting, even the elderly can have an emotional connection.
Aunt Liu and Uncle Wu were originally dance partners, the two had a good relationship and talked to each other, and gradually they came together and broke through the bottom line of morality. But later, Aunt Liu was tired of Uncle Wu, so she changed to a more skilled Uncle Chen. They were not only in Uncle Chen's house, but also went to the hotel, as if they had regained the passion of their youth.
However, square dancing is only a superficial reason, and the deep reason is that Aunt Liu and his wife Uncle Zhou are half-way couples, and when they were young, Uncle Zhou had a good business family, and after the two met, Aunt Liu took the initiative to approach Uncle Zhou, and finally let him leave his original family and come together with her. As time passed, the relationship between the two gradually weakened, especially after Uncle Zhou's business failed, Aunt Liu looked at him even more unfavorably. Square dancing every day became her habit, but Uncle Zhou strongly opposed it, but she was unmoved.
When Aunt Liu was found to be infected with AIDS, she lost her spirit to square dance, sat listlessly at home all day, refusing to answer Uncle Zhou's inquiry. Uncle Zhou eventually discovers the truth in the medical examination report, but his reaction surprises Aunt Liu, and he kills her with a fruit knife. After that, Uncle Zhou called the police and was punished by law.