Lian Zhang is a survivor of the apocalypse, a 30-year-old man who suffers from Myasthenia Gravis, a chronic disease that limits his movements and makes him dependent on medication to survive.
The apocalypse began in 2049, and it is currently 2050. Lian has been isolated from other people since the beginning of the apocalypse, which has made him long for human contact, although he is still cautious—because in the apocalypse, the living can be just as dangerous as the dead.