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Chen Xiaoshi, a partner of a listed company, was dropped from the rooftop of the 16th floor by her friend and boss Teacher Liu at a company executive gathering. She accidentally traveled back in time from her thirties to the time when she was taking her junior high school entrance exam, only to find that a twin sister who looked exactly like her appeared out of thin air in her home. Her family, friends, and teachers were never surprised by this, as if they were twins. Chen Xiaoshi wanted to find out everything, and started a game in this possibly misplaced world...