In the household of Lee Gyeong-jin, a high-ranking official of Joseon Kingdom, three sons die from an unidentified horror. A woman pregnant with a child of the third son soon learns of the evil spirit that haunts the house.
Min-seok has a crush on a regular customer. His crush evolves into love that eventually devolves into a dangerous obsession. When his crush fails to come to the cafe, he becomes increasingly worried and sneaks in to check on her and kidnaps her.
One day, a crisis hits genius high school students Min Hoon, Shi Woo, and I Hyun, who were making horror games. Ghost characters popped out into the real world in their game 'Horror Mate'! They take care of the game stage to catch the ghosts!
