C1906 Liar
They had to start with the first of the first row, and then half a dozen more.
In fact, they didn't have any purpose. They just wanted to see which room Chen Dong was in.
However, they were very lucky. They found Chen Dong's bedroom on the third one.
They could tell the difference between Chen Dong's room and Zhang Xiaoli's room almost at a glance.
Unlike Zhang Xiaoli's clean and tidy room