Synopsis：Philosophy student Xiao Mo begins an internship at a funeral home, seeking answers to the mysteries of life and death, only to encounter the bizarre death of his mentor, Chen Hui. A legend circulates in the village about a "Echo Well" that can bring the dead back to life. After Chen Hui's son dies in an accident, Chen Hui makes a wish at the ancient well, only to vanish the next day. Xiao Mo returns to the village with the mysterious mortician Old Bai Tou to investigate. Using science, Old Bai Tou systematically debunks the "supernatural" phenomena: the corpse in the well, the hanging of the adopted daughter, the ghostly maze in the thick fog—all are meticulously orchestrated deceptions. When obsession meets science and lies are torn apart by truth, everyone realizes that the true abyss lies not in the well, but in the human heart.