The Third Floor You Can Never Escape

Four years ago, an accident during the Zero Plan experiment at Huaguang Electronics Factory led physicist Gu Changming to be declared dead. Four years later, six registered letters bearing the names of the dead summon back to this abandoned building the six people who signed, kept silent, and chose not to speak up back then. A rusted-shut iron door, a third floor with no way out, and a consciousness field that tampers with memories. They are trapped at 19:17, the moment the accident happened.