She may call a person as brother or sister when she is acting like Rong Rong. But when she is in the form of her true self, Shao Rong, she would not even speak softly to a random person.
Just Yingjie is an example. She may have smiled at him and spoke a few words because he is the friend of both Ren Weimin and Sun Bingwen but if one were to look closely, her voice would always sound cold and distant.
She never treated him as a close person who could exactly enter her circle. She never crossed the line between her people and a stranger when she was with him.
This is the case with everyone else too. She laughed closely when she was with Chenguang when she acted as Rong Rong. But once she turned back into Shao Rong, she rarely spoke a word with her.
All these details are simple yet noticeable. But Sun Bingwen did not think much about these until now.