C433 The case be a puzzle

When the two officers on duty heard Li Xiang asking them again and again if they had left alone before, they could guess that Li Xiang was suspecting them in his heart.

The one called Xiao Liu said, "Brother Hei, what do you mean by that? Are you doubting us? I can tell you, the two of us sat in that chair all night and didn't even go to the toilet