1:10

Amidst her despair, top star Sun-jae was the only hope for Im Sol. 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, 15 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 devoted to swimming. But how does Sol, who didn't even know his existence up until yesterday, know his name?