C331 How do i know they're still alive

The two of them started coughing violently, and some of them even started to pass out. Luo Jie covered his nose as he tried to open the door, but he found that the door was locked from the inside.

They already knew what it was. If they didn't leave soon, they would really be poisoned to death!

Xu Yi quickly ran over and tried to open the window, but he found that it was useless