C360 Sudden Change(part Ii)

"Instructor Du?" What was going on? Is there something you're hiding from me? " Zhang Ziyu looked at the change in Du Lei's expression and asked. Zhang Ziyu also noticed that something was not right. This was the first time he saw Du Lei like this, as if there was something he couldn't explain.

Du Lei didn't say anything. He just looked at Zhang Ziyu and took two steps back