In the mid-slopes of Odaesan Mountain, Hongcheon, Gangwon Province, a dark brown wooden door appeared under the shadow of the trees. The door creaked open slowly, emitting a chilling sound, as if echoing the person’s emotions.

Soon, a young man in a black baseball cap and jacket stepped out. His face was barely visible under the hat, obscured further by a mask. 

His worn sneakers crunched on the overgrown grass as he stood still, surveying his surroundings. Once he confirmed that no one else was around, he crouched down in front of the door. His voice, distorted in an odd …