"It because I like you - everything's okay."

All was well in EXO Mental Ward. The patients - Suho, D.O, Kris, Tao, Chen, Xuimin, Baekhyun, Chanyeol, Lay, and Luhan - are busy doing their own things while the only doctors in the ward - namely Sehun and Jongin - are busy with paperworks and taking care of the patients. Everything was in place until one day someone started killing them one by one...   Who is the Killer? More importantly... Who will live?