A woman who lives each day to fullest with a second chance. A man who struggles to move on from his first love.   Song Jihyun was once a terminally ill patient, but was given a second chance after getting a heart transplant from a donor, now she lives her life to the fullest each day. Do Kyungsoo was a heartbroken man who was still unable to move on from his fiancee who died in an car

Ahn Seojin didn't knew that one accidental bump into the school's bad boy would make her life goes into all directions. Also, she didn't expected that saving him from a fight that night would caused her to be entangled in his life. But out of all the list of the unexpected events that would happens with Chanyeol, she didn't expects that she would also fall for the bad boy.