C2190 Why?

"Human, you're good." A deep voice suddenly sounded in Lin Sen's ears. He was shocked and turned around. There was nothing behind him.

"Who is it?" Lin Sen asked in a low voice.

"You can't see me!" This reply made Lin Sen couldn't help but curse in his heart, "Do you think you are a ghost? I can't even see you. Come out if you have the ability. I can't see you."

Lin Sen didn't say anything