Bo Young moves into the mansion of the previously wealthy grandmother, Wang, as a caregiver with a dangerous intention.  Mother Kim, the only blood relative of Wang who hired Bo Young, sets conditions such as 'Do not bring anyone, especially children,' and 'Do not go near the reservoir'.  Ominous and bizarre signs continue in grandmother Wang's huge mansion located next to a reservoir called 'Gwimot', where people are dying, and Bo Young finds out that foreigners who have visited the place have suffered a mysterious death...

Devil in the Lake

YouTube horror storyteller Da-kyung, recovering from a loss of subscribers, collaborates with the agency producer Woo-jin to find a powerful real-life horror story. Their quest leads them to Gwangrim Station, where the stationmaster reveals a series of eerie events. Her videos started to gain popularity, prompting her to become obsessed with the station. The stationmaster suggests a daring move for Da-kyung to board the ghost train herself.