It was obvious that the knocking came from a little ghost. It wasn't loud to avoid disturbing others, but Li Tian and Lin Yi were alerted.
Lin Yi's senses were particularly strong, and Li Tian didn't sleep very well.
Although he hadn't had much rest for a few days, Li Tian felt like he was back in Africa. He didn't have to sleep so much to prevent an enemy attack.
When he heard little ghost's voice, he immediately got up from the bed, put on his coat quickly, and went downstairs.
Little ghost actually had a room here, but he had to be on duty at night, so the door of the villa would not be opened. If he wanted to come in, he could only knock.
This was the ghost king's suggestion, and everyone agreed to it. After all, the villa's door was open, and there was a possibility of someone sneaking in.