I Broke into the Mine to Uncover the Secrets of My Father's Generation

Ten years ago, my father mysteriously disappeared in a red mud mine and was officially declared dead. Ten years later, half of a severed hand with a cross mark appeared out of thin air in my refrigerator. The severed hand leads the way, and the cross serves as the key, forcing me to step into the death mine that has been abandoned for ten years. Footprints in the mine tunnel, brand new old shoes, the sound of breathing against the door... All clues point to one truth: my dad is still alive.