I Couldn't Tell You Who It Was Vol. 1

A mansion with 101 rooms. A man surrounded by demons. A murder mystery. As a child, Nam Haeseo wandered into a mansion with 101 rooms and became haunted by creatures only he could see. To make matters worse, he was mistreated by everyone around him. It wasn't until he met Ham Yeonseon that he learned the meaning of love. However, Yeonseon's premature death left a gaping wound in Haeseo's heart. Later in life, Haeseo agrees to appear on a reality show centered on the internet myth about a mansion with 101 doors.
The show places the contestants within a labyrinthian mansion on a remote island, and participants must find the key and escape in order to win. However, a show that should be for entertainment only turns sickeningly real when the players awaken to find an elevator stuffed full of the mangled corpses of the filming crew. Trapped in a mansion of unknown perils, Haeseo can't help but wonder if there is more to this mystery than meets the eye. Within these haunted halls is a past buried in the recesses of memory.