One day, a classmate in the dorm lost money in the morning. The other two people in the dorm were there. One said he stayed up all night at the internet cafe and didn't know anything. The other said he had reminded him to keep his wallet safe to avoid losing it. However, later the police took both of them away. Why? \Based on a true event that happened in the dorm\
Stayed up all night: that is, spent the night at the internet cafe
