Huilin had heard since he was a child that there was a taboo soul-devouring creature hidden in the dark forest behind the village, but no one knew its true identity. A sudden plague swept through their homes, and villagers pointed to the "indescribable" existence deep in the forest. In order to save his mother, Huilin stepped into the dense forest alone, surrounded by black mist, and unknown whispers echoed in his ears. Gradually going deeper, he discovered that those so-called monsters were forgotten creations, shadows of human nature, and "truths" shaped by fear and lies. Huilin must choose between survival and exposure, faith and reason, and the darkness around him is entangled with his own secrets. Every step is like walking a tightrope. If you hesitate for a moment, you will fall into the abyss of eternal destruction. This is a showdown between man and secret, light and darkness - in the heart of the forest, Huilin will face not only creatures, but also the most secret night of human nature.