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This is a story about childhood sweethearts, a story of pursuit and deliberate pursuit. Yan Xancao, who is smart about big things and confused about small things, has only one creed in life, and that is not to leave any chance of regret for himself tomorrow. But obviously, this is not suitable for applying to his childhood sweetheart. Although she was an orphan, she never felt inferior to her status. As long as she wants it, whether it is study, work, life, or relationships, she will try her best to work hard. But when the person she wants to win over brings back a person who is said to be his "girlfriend", how should she continue to work hard? Or... Should I graduate first? But the troublesome younger siblings who have never met before also come to hinder her, so what's going on?

Two people with exactly the same appearance and body shape exchange identities and time and space.