(Black pearls. Said to bring wealth, wisdom, and prosperity.)

Lee Hongbin had never been a believer in the supernatural. To him, life was only black and white; there weren't even any grey areas. This is what made him the best detective in his devision with the most solved cases of anyone his age...

Until he was faced with a series of disappearances that were unexplainable and random. The only way he could link each incident together were the black pearls that were left at each scene and a girl who kept showing up right after every disappearance was called in.

What did it mean? Why were these seemingly random people going missing? Who was the girl that kept showing up at the station? What was he getting himself into?