Lei Yu, also called Lei Xiaoyu, is a supporting character, Lei Dian's sister who works at a phone shop. She is fair-skinned, refined, and beautiful with a virtuous wife look. Initially cold towards Lei Dian and Cao Yang, she suspects Cao Yang of being a bad influence and warns him not to lead her brother astray. She is professional, helping Cao Yang buy and set up his Nokia phone. She is protective of her brother and cautious about strangers.
