While you are on vacation at a villa, you walk into a living room. You see a porcelain doll sitting on one of the chairs. The doll is silent and a little creepy. As you walk into your room, you find a piece of paper under the bed. It turns out to be the rules for the doll: 1. Bathe him properly. 2. Play with him. 3. If the atmosphere starts to get tense, immediately take him to sleep and sing a lullaby. You laughed a little and belittled the paper, but somehow you felt cold and finally obeyed the order during your vacation there.