12 Suicidal Teens

One day, 12 teenagers met inside an abandoned hospital to commit euthanasia.
“It is not horrible if we die together…”
However, they found the body of an unknown youth when getting to the meeting place. Exhibits were unnaturally left behind and somethings mystical happened in this secret chamber. And, the most important thing is, no one but only they know this “euthanasia plan”. So, is a murderer among them? 12 teenagers had no choice but to stop the euthanasia.
Solving murder riddle under lies and suspicion, reasons to commit suicide were also exposed.
Will 12 teenagers end their life to relieve suffering? Or will they be killed by someone in fear? The suspense game in a secret chamber now begins.