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Yang Chunhua, a newly graduated college student, has always been troubled by the same nightmare. He followed the advice of his friends and came to Nanjing to find a "ghost" who was keen on traveling around the world's subways to help him get rid of his nightmares. However, he discovered that the "ghost" with great powers was just a girl of about sixteen years old. The convenience store she ran opened special services to citizens at night. And Yang Chunhua's nightmare seems to contain an amazing conspiracy...