Ghost Trickster

This is not something I should have considered... But when I typed the last word on the keyboard, I saw a person behind me... He just looked at me like this, standing behind me. The wind made me feel cool, but I didn't close the window... I got up to close the window, picked up the kettle and poured some boiling water, but I didn't have two cups, so I didn't pour it for him... But I still asked him: Do you want to drink water? He shook his head.