Seoul Private School sends letter to every former student  several years after their senior graduation for a formal reunion. Park Sooyoung, the very wellknown popular and very well respected student, was beyond ecstatic to attend. It was expected to be one of her happy evenings, to reminisce her teenage years with her beloved childhood friends and especially to hold the twelve year anniversary since one of her best-friend's brutal suicide. However as one of her former best-friends was to hold an honorable speech, tables have suddenly been turned. The claimed 'suicide' had been re-claimed as a sudden murder in disguise, rumored to have been planned by the one and only ''once honorable and popular'' Park Sooyoung.