Yin Dong aloofness became more apparent when he entered his rebellious phase. The only one who could get close to him was his sister.
To him, she was someone precious; this might have to do with the kinship that he had with her.
Even his parents could not match the love he had for her.
The young him did not realize that the nature of their relationship had changed. It was at a crossroads.
His sister's dependency on him had gradually turned into possessiveness.
The two were so close that they slept on the same bed until junior high school.
When she entered high school, her body hit puberty.
The boy was a freshman then. After his biology class, he came to understand sexuality; hence, he slowly distanced himself from his sister's intimacy.
The difference between him and Yin Xiachun was that, when the latter entered puberty, she was quick to discover that her love for him had gone beyond the norm.