Dorae Lee, a shy and lonely college junior, is unexpectedly reunited with her high school crush, Haewon Cha, who is just as handsome as she remembers. However, their reunion takes an unexpected turn when Haewon confesses his feelings to Dorae, despite already having a popular girlfriend who is also Dorae's friend. Complicating matters further, Haewon believes he is still eighteen years old, having lost five years of memories due to a car accident. As Haewon becomes determined to make Dorae his girlfriend, the two are faced with the question of whether their first love can survive the challenges of reality.
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