Tells the story of Chen Si Xian, a young man who feels trapped in a relationship with his college sweetheart, Xiao Yu, who is constantly 'breaking up' with him. When she goes to Shanghai on a business trip, Si Xian decides to go out with an old flame but gets caught out. After suffering a tragedy, Si Xian goes on a journey to try and turn back time and change that regrettable night.

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