Who was hiding behind the door?

Chen Chu Chu rushed over to the doors of the Chen residence but as soon as she came out of the house, she saw that there was nothing. Forget about a human, she could not even see the presence of a ghost! This confused her as she looked at the empty courtyard of the Chen residence that was completely devoid of any presence and then turned to look at Chen Xi who just finished taking shelter into the skin of her agent.