该片讲述了两个拥有患有精神分裂症儿子的母亲住在一个公寓里,展开的心理惊悚片,因为反映了韩国社会冰冷的一面而让人期待。。Detective Ryoo Yi Jae lost his beloved son in a hit-and-run accident. Without finding the criminal, the statute of limitations passed and the family collapsed. He was transferred to Namwon after drinking alcohol to soothe his exhausted daily life. When he was about to live a new life from meeting Eom So Hyun, he ran into Im Hak Chon by chance, the murderer of his son.。在小孩子之间,流传着一个传说,在深夜零时正,心怀怨恨的人就能够进入一个名为“地狱通信”的网页。在网页上打上怨恨之人的名字,名为阎魔爱的“地狱少女”就会显现于心怀怨恨者的身旁。地狱少女其后会交给对方一个颈部系有红线的稻草人,并说明契约方式和后果:只要解开红线,契约就会成立,地狱少女会将对方所怨恨者流放到地狱。但是,对方在解除怨恨后,亦要付出代价。对方决定把受诅人流放到地狱,自己在死后也要面对同一命运……至于是否要解开红线,完全是委托人的决定。“害人终害己。当对方下地狱的同时,你死后你的灵魂也会随之下地狱,即使这样你也愿意吗?”。