A 20 year old university student, Park Chae Eun, woke up with no memories. The accident took away everything she had, leaving her to live life without experience. She struggled with life. That was until she met him, one whom she had never known, but was so familiar with. 

He too was involved in an accident at the same time. God spared him and his memories. However, he felt something was missing. He worked his way to finding that missing piece, and the mysterious voice.