Following a decade-long biological catastrophe, humans have settled into life beneath the earth’s surface. The surface world has gradually faded into myth, regarded only as the realm of the dead. But at the stroke of midnight, an enigmatic red Bus No. 0 appears - with a mysterious guide - taking thrill-seekers and the curious up to the forsaken surface through an obscure path. According to scattered rumors, only one rider has ever returned - trapped between lucidity and madness - while the rest remain missing. Despite police investigations, all attempts to trace the bus have ended in vain. People now call it Death Bus 0. 
Seven tickets have been delivered. The realm of the dead has opened. The journey awaits. Who is the guide behind the Death Bus? And who will survive till the end?