Zhu Yu pinched Gu Hui's flesh nervously and it hurt, but Gu Hui didn't say anything, knowing that she was scared, so this could alleviate her fear.

As they continued to move along the corridor, Gu Hui and Zhu Yu could hear the sound getting louder and louder. Zhu Yu always felt that they might encounter ghosts unexpectedly, so they became even more nervous and kept close to each other.

It stuck to Gu Hui's body.

"Um?"

Yu Fei suddenly stopped and looked at a room on the side.

"What's wrong?"

Gu Hui asked in a low voice.

Zhu Yu was so frightened that she didn't dare to breathe.

"This room is louder than the other rooms!"

Yu Fei turned around and explained.

"hiss……"

Zhu Yu took a breath of cold air.

Yu Fei's words sounded to her as if he was saying that the source of the sound was here.

Gu Hui also felt that when he walked to the door of this room, the sound suddenly became louder.

Gu Hui handed the room card to Yu Fei, and Yu Fei didn't make any unnecessary moves. He took the universal room card and swiped it, and the door opened instantly.

Yu Fei pushed open the door and inserted the room card into the card slot inside the door.

The lights in the room quickly turned on, and the room looked normal. The sheets and bedding were all there, and there were even paid food and drinks on the table.

They looked up together and realized the truth immediately. The filter on the vent in this room was missing. No wonder the sound here was suddenly much louder than the previous room.

Yu Fei walked in and moved the stool over. He happened to come in, so he locked on the source of the sound again.

Seeing Yu Fei put his head into the dark pipe again, Zhu Yu frowned again, and the previous fantasy reappeared in his brain.

"Let's go on!"

Yu Fei listened for a moment, took his head back, jumped down, took back the room card, closed the door and prepared to move on.

Obviously the room just now is not the source of the sound, so we need to continue looking for the source of the sound.

As they continued to move forward, they encountered another corner. To connect all the rooms on this entire floor, there would inevitably be many corridors in different directions.

After turning a corner and walking for a while, Yu Fei stopped again.

"Did you discover it?"

Yu Fei turned to Gu Hui and asked.

"Um!"

Gu Hui nodded after listening.

Yu Fei didn't speak any more and continued to move forward.

"???"
Chapter completed!