C2264 A Strange Person!

The reason why Lin Xi woke up was because he heard a series of "pa, pa" sounds, as if someone was knocking on the door outside. However, that sound was soft and weak, and it did not sound like a normal person knocking on the door.

Another two "pa, pa" sounds came from the door.

What was going on?

Lin Xu instantly lost all his sleepiness and immediately sat up from the bed