Im Sol is devastated by the sudden and tragic death of her favorite star, Ryu Sun-jae, a former swimmer turned K-pop idol. But in the midst of her anguish, she magically time slips back to 2008 – when Sun-jae is still only 19 years old! Delighted that she has a chance to help him avert his unhappy future fate, Sol makes it her mission to change the future... and maybe find love along the way.