Mystery in the Ridge

What is buried in Nanling? Of the twelve people in the group, only one escaped in the end. Ten years later, a new exploration team assembled again. The first thing to be broken was the peaceful life of an ordinary bookstore owner. The unsolved case of my deceased sister's death is unsolved, and her old friend keeps blackmailing me. Now my friend is joining the team to invite me, so I try to find a way to break the situation. "I was the one who was alive ten years ago, and I still want to be alive ten years from now."