When he looks at the bloodstain, he realizes that it's half dried human blood. He wipes the blood off in disgust. As the blood tracks stop at the second-floor, he has to look for clues. There's a faint knock at the door, and yirui lights the light to see what's going on. He sees a boy with a pale face and blue lips. His eyes are so big that they seem like they're going to burst out of his eyes. . He's shocked and falls to the ground, his phone drops, and he fumbles to get it back. The boy is gone.