“Some people are meant to fall in love with each other, but not meant to be together.”

Kwon Ji Yong was given a second chance by God, waking up to find out that he wasn't dead after his car accident. And his first love, Yoona was still alive, but in a coma after her accident. Donghae, who happened to witness the traumatic accident of Yoona, suffered from PTSD as he blamed himself for not having saved her.  

A year had passed and Yoona was still in a coma. At Ji Yong's lowest point of life, Jessica came into his life and they found themselves falling deeply in love with each other. As their relationship developes, Yoona awakens, only to be diagnosed with Anterograde Amnesia, and she was completely oblivious to what has happened during that one year.