Sun Jiahui is a freelance writer and former editor at The World of Chinese. She writes about Chinese language, society and culture, and is especially passionate about sharing stories of China's ancient past with a wider audience. She has been writing for TWOC for over six years, and pens the Choice Chengyu column.
How Chinese ID cards evolved from simple handwritten cards in 1984, to sophisticated digital documents essential for everything from riding the train to playing video games