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Xue Cong (played by Chen Hao), who returned from Toronto, has painted mysterious patterns in different corners of Hong Kong for many years, and has not been discovered by anyone. Until recently, Xiao Xue (played by Meng Tingyi), who went south from Changchun to become a Mandarin teacher, accidentally discovered and successfully cracked all these dotted pictures without numbers, and one after another patterns and memories closely related to Hong Kong in the past came to life in this busy city. But who exactly left these patterns? And who will connect it? The two decided to start a game of guessing in a city that has been open for more than 170 years and has been home to more than 7 million people......