First Love (2015)

Ha-young, a patient with short-term amnesia, is living as a high school student when she unexpectedly encounters Lim Sung-sik, a psychiatrist she briefly interviewed during a recording session. This triggers a resurgence of her suppressed hallucinations and nightmares. Seeking answers, Ha-young reaches out to Sung-sik, unaware that his involvement is deliberate. He once had a similar first love to her, experiencing tragedy that caused her to lose her memories of that time. Her forgotten experiences—a cherished chocolate, beloved music, and advice from a program—begin to resurface as her psychological symptoms worsen. Ultimately, Sung-sik abandons Ha-young but then attempts to harm So-hee, a woman he loved romantically. This act fully restores Ha-young's tragic memories of that day.