Yoo-rasuffersfromnightmareseverynight.Onedayshemeetsherhighschoolfriends.Jin-taeisapromisingartist,In-seokisachaebolandformerthug,Hye-jinlikesIn-seok,andSeong-ho,whousedtobeIn-seokserrandboy,finallymeetup.Yoo-raasksherfriendsiftheyremembertheclassmatethatkilledherself.Everyoneisflusteredandclaimstheydont. Yoo-ragoestothebathroom,butpassesoutafterseeingherselfinthemirror.EveryonegetsinIn-seokscartosendYoo-rahome,buttheygetintoanaccidentandallbecomeunconscious.Whentheywakeup,theyareatafamiliarschoolthatsclosed.Itwastheschooltheywenttothathascloseddown. Whydidtheyendupthere?Yoo-raandherfriendstrembleinfearfortheirlives...