Cheng Bingbing and Chen Zhenzhen, who had not seen each other for 6 years, met because they were picking up their younger sister and younger brother. But as soon as they met, Cheng Bingbing led her sister and ran home like crazy, as if Chen Zhen was really a demon she was afraid of, and she immediately had a nightmare when she got home. But Chen Zhenzhen's mathematics problem-solving notes are hidden in her home. Chen Zhenzhen actually knew that her younger brother and Cheng Bingbing's sister went to the same kindergarten, and even applied for the same university and the same major as Cheng Bingbing. Their past will be revealed bit by bit this summer.
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