Yoo-rasuffersfromnightmareseverynight.Onedayshemeetsherhighschoolfriends.Jin-taeisapromisingartist,In-seokisachaebolandformerthug,Hye-jinlikesIn-seok,andSeong-ho,whousedtobeIn-seok'serrandboy,finallymeetup.Yoo-raasksherfriendsiftheyremembertheclassmatethatkilledherself.Everyoneisflusteredandclaimstheydon't.Yoo-ragoestothebathroom,butpassesoutafterseeingherselfinthemirror.EveryonegetsinIn-seok'scartosendYoo-rahome,buttheygetintoanaccidentandallbecomeunconscious.Whentheywakeup,theyareatafamiliarschoolthat'sclosed.Itwastheschooltheywenttothathascloseddown.Whydidtheyendupthere?Yoo-raandherfriendstrembleinfearfortheirlives...