C160 High speed rail(part i)

"One is surnamed Wu and the other is surnamed Sun. Are you two siblings?" or was it brother and sister? " Zheng Haotian was in disbelief. This surname was definitely different. Where did this brother and sister come from? Is there a problem with this?

"I have my mother's surname. Why do you have so many questions? " Sun Zhenzhen looked at Zheng Haotian and said