His biological younger sister didn't care about his feelings nor the fact that Shen Xiyin was her niece. She tried to harm Shen Xiyin. It was her fault, so she deserved punishment.
Shen Xiyin was completely innocent. She had never hurt Shen Yamei's family before.
Shen Xiyin was more outstanding than Shen Yamei's daughter, but it was the result of her effort. How could they hurt her just because they were jealous of her?
"They're so malicious to try to harm Xiyin just because of that!" Shen Xiyao stood up and said angrily, "They have to give me an explanation."
Saying that, he wanted to go out.
He always respected his aunt, because she treated them well. However, his respect for her disappeared after finding out what she had done.
In fact, they treated Shen Yamei's family very well too, and they were helping them all the time.