A young girl is kidnapped by a serial killer. The serial killer uses manholes to kidnap and kill his victims. The young girl's older sister tries to save her before it's too late.
Best friends ‘Hodu’ and ‘Yeji’ are job seekers whose dreams and hopes have been ruined. One day, ‘Hodu’ luckily gets a decent cheap fully loaded rent house. ‘Yeji’, who has been kicked out of her parents’ house, also stays there with him. They gradually feel a strange energy in the house that seemed perfect. They encounter ominous ghost and freaked out. With no place to go and no money, they try to defeat the ghost to protect their house…
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...
Yoo-ra suffers from nightmares every night. One day she meets her high school friends. Jin-tae is a promising artist, In-seok is a chaebol and former thug, Hye-jin likes In-seok, and Seong-ho, who used to be In-seok's errand boy, finally meet up. Yoo-ra asks her friends if they remember the classmate that killed herself. Everyone is flustered and claims they don't.
Yoo-ra goes to the bathroom, but passes out after seeing herself in the mirror. Everyone gets in In-seok's car to send Yoo-ra home, but they get into an accident and all become unconscious. When they wake up, they are at a familiar school that's closed. It was the school they went to that has closed down.