Cultivation of Immortality Begins with Keeping Corpses

In the early morning, you are awakened by a knock on the door. My mother's voice came from outside the door: "It's time to get up." But your mother was laid to rest seven days ago. You look out through the crack in the door and see your mother serving breakfast with a kind smile. But her smile was exactly the same as the one that was sewn out when she was buried. Then she spoke up with rule number two: "No matter who opens the door for you, don't let anyone in again." Before you could react, your own voice came from behind you, from under the bed: "Don't go out, the one outside... Is not me."