The two brothers Cheng Miao and Cheng Miao lived in the same town as Chi Zhou when they were young. Since their homes were separated by a road, they went to and from elementary school, junior high school and high school together.
When the two were 18 years old, Cheng Min and Cheng Miao differentiated into Omega. Chizhou differentiated into Alpha. Both parents were very happy when they knew the gender of the other's child after the differentiation. This was because the parents had discussed it before the child was born. If the child differentiated into an Omega and an Alpha, they would be allowed to get a marriage certificate when they reach the legal marriage age. If the two children are of the same gender after the differentiation, they would become brothers.
Note: [Liuzhou Cheng Page] Parents of Cheng Min's two brothers and sisters
Wen An Chi FengChizhou's parents
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