Responses
Yes, surname comes first. I was also surprised by the name on the phone as I had assumed Jian Yi was his full given name (I myself have two characters in my Chinese given name). But it seems Jian is the family name, and Yi his given name. One character given names is a tradition that sort of started around the rise of communism in China (according to my mother lol).
http://www.mangago.zone/read-manga/19_days/bt/c168/pg-1/
Correct me if I'm wrong, but for Chinese names, doesn't the surname come first?? Maybe the person on the phone is Jian Yi's dad or relative, and they want him. But the mom doesn't want him to be involved in that family "business".