C180 What a Strange Uncle

The cashier saw the black card that Gu Xiangsi had taken out. She remembered reading about it in a magazine news article.

"A black card!?" The cashier's eyes widened so much that they almost fell out of their sockets. She casually swiped the card, and there were dense numbers on it, not including decimal points.

Gu Xiangsi looked at the cashier's serious expression