Meet Son Eunmi, an ordinary 17-year-old girl. She has a lot of friends but there is only one person she could call a real one. And that is Nam Woohyun, his best bud since birth. Eunmi was such a sweetheart but after the accident, her life has changed. Nonetheless, she was grateful enough to have Woohyun in her life. Just when she thought she was the person who has suffered the most on earth, Sungjong came.