Case File One: The Corpse of the Old Woman in Xiahe Village"There was a 53-year-old woman in Xiahe Village. She was known for being greedy and taking advantage of others to extort small amounts of money. People disliked dealing with her. One day, she suddenly changed her behavior and went door-to-door apologizing, but no one wanted to forgive her. The woman became more and more desperate each day. By the seventh day, she was wailing all night, keeping the whole village awake.",The more Lin Yu looked, the more confused he became. He couldn't find any common points among the cases. The only thing they had in common was that all the victims died seven days later.,“The man said that if he found the key point, he could survive. As long as I find the key point, I can survive too!!!”。