Duan Qingya's left eye stung as he saw the 18th extra button in the elevator. He thought he stayed up too late. Until the door opened and he was pulled into a collapsing space - there was a crack in the rules and a note saying "Welcome".
His parents disappeared three years ago, leaving only a notebook filled with strange symbols. Duan Qingya finally understood that those symbols were not passwords, but "tear points".
Someone is deliberately tearing the city apart. And he was chosen to be the one to sew up the rift.