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Im Sol developed paraplegia due to a mishap 15 years ago. In her seemingly dark and hopeless life, she comes across a ray of light, Ryu Sun-jae, a famous artist. Sun-jae's voice reassured her, and his words gave her the energy to live through rough days. However, one day, she hears shocking news that Sun-jae has died a tragic death. Her whole world turns upside down and wakes up crying, only to find herself in the past, 13 years ago when Sun-jae is still alive. Sol takes up this chance and is determined to do her best to save Sun-jae. Meanwhile in this past, Sun-jae is a student only devoted to swimming. But how does Sol, who didn't even know his existence up until yesterday, know his name?