It's been a year since Yujin lost her bestfriend in a car accident. However, she can't seemed to move on from it. Hoping to move on from Wonyoung's death, she reaches out to the recipient of her bestfriend's donated organs. But, of all the important parts that was donated, it is the heart recipient who didn't showed up. Yujin needs to meet her. She just needed a closure to move on.  She went out to search for the girl who have her bestfriend's heart. And her name is Ki