"In the Heat of the Sun" tells a story: in Beijing in the early 1970s, adults were busy "revolutionary", schools were closed, and a group of fifteen or sixteen-year-old boys in a military compound indulged all day In fighting and making trouble, Ma Xiaojun is one of them. He has a hobby of using a master key to steal the locks of other people's houses. He often takes advantage of the day when most of the house is empty, opens the locks and sneaks into other people's houses. , and he was never found.
One day, Ma Xiaojun entered another house and saw a photo of a girl in a swimsuit. He was immediately attracted to this unknown girl with a bright smile and youthful vigor. Through Liu Yiku, the "leader" of the children in the courtyard, Ma Xiaojun actually met Milan, the girl he saw in the photos. Milan, who is prettier than the photos, immediately became Ma Xiaojun's dream lover, but Milan didn't take him as a big child at all, but liked Liu Yiku. Ma Xiaojun was so angry that he found fault with Liu Yi and had a hard fight. Ma Xiaojun's father was very angry at him hanging out with others all day long. He scolded Xiaojun for not studying hard and beat him hard, but the parents didn't have time to take care of them, and the children continued to mix. In this way, in that special period, the children grew up in chaos
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