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A modern person who was repeatedly told by her past lover in her dream "I am waiting for you outside the dream" gradually uncovered the truth about her past life through "dream mixing" in a mysterious bar, only to find that dreams are eroding reality inch by inch - and when she finally found the person who has been waiting for thousands of years, a bigger conspiracy has just surfaced: he is not the only one waiting, and she is not the only one who has awakened.