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This is a romantic fantasy story about Da Ran's fianc\u00E9 Yun Jae, who was working as a part-time high school teacher while preparing for the teacher employment exam, and Gyeong Jun, a student who transferred to the school where Da Ran works. The story begins as their souls are changed due to a car accident. As Yun Jae's condition worsens, Da Ran is in despair, unable to solve the complex problems she has faced. Their love is also on the verge of a breakup. What will happen to this childish adolescent?