Im Sol is devastated by the sudden and tragic death of her idol Ryu Sun-Jae, a former swimmer turned K-pop star. But in the midst of her grief, she magically travels back to 2008 - when Sun-Jae was only 19 years old! Sol is delighted that she can help him escape his sad future fate, and makes it her mission to change the future ... and maybe even find true love in the process. Will her attempts to change the course of the past succeed - or could they have unexpected consequences?