C2059 Six Digits?

Six digits in chapter 2059?

"What is this?" Ye Yong pointed at the number and asked the young nurse.

The young nurse looked at it and shook her head in confusion. "I don't know. We didn't ask them to register this number. Six digits? What is this? "

...

Qin Jun and Xiaoxing had checked all the entry and exit records, including the bus station and train station records