"Knock, knock, knock, knock, knock." As usual, it's three long, two short, two short, three long.
But after both sets of codes were tapped, the expected sound of the door opening didn't occur.
Huo Yuankai, unwilling to accept this, knocked again, but the result remained the same.
Huo Yuankai was about to try again, but this time Hua Biao stepped in to stop him.
The situation was obvious; if the children had really returned, there's no reason they wouldn't open the door when the code was clear.
Unless...
Pulling Huo Yuankai over, Hua Biao stepped forward, then bent down, avoiding the peephole, pressing his ear against the door to listen inside.
Moments later, he pulled back his ear, his expression growing increasingly serious.
No sound!
There are three possibilities: first, the children have returned, but because of external factors, they can't open the door.
This factor could be twofold:
