In the country town in the deep night, everything is quiet. Occasionally, someone's dog barks a few times, and the silence is restored again. In the dark, three black shadows quickly sneak into the upstairs of the inn, quickly touch the windows of the three guest rooms, poke a small round hole in it, take out a small tube from the body, and gently blow it inside. Wait for a moment, the three of them open the three doors of the guest room and walk inside.

"bang", as if an invisible wall is blocked, as long as you want to walk to the bedside, it will pop up so silently....