A journey to an old place many years later, a mysterious welfare institution hidden in the mountains. The friend who mysteriously disappeared, the mentally disturbed Lao Zhangtou, and the dean who hesitated to speak. What happened on that night of farewell many years ago? The truth buried by time will be slowly revealed after revisiting the old place many years later. Is it sin or greedy human nature? After the storm, we will eventually be destroyed by ourselves, leaving no bones left...