Strange Tales of Rules: Starting with Mom's Note

In a parallel world, a strange tale of rules descends. Each country randomly selects one contestant; the contestant's death brings a strange tale to their country. Only by clearing the challenge can the tale be eliminated. Lin Feng is fortunate enough to be selected to represent the Dragon Kingdom in this strange tale. The first tale is a note from his mother: "Mom can no longer come back. Remember to go to Grandma's house in three days. 1. It's best to leave between 9 PM and 11 PM, not at other times. 2. When you leave, don't look up; remember to keep your eyes on your feet. 3. At home, don't open the door no matter who knocks."