The pure and touching love story between a high school girl who suffers from anterograde amnesia, whose memories are reset when she wakes up, and an ordinary high school boy who lives a dull daily life. Kim Jae Won is a pretty boy suffering from hereditary heart failure. He is a boy who has no purpose in life due to the disease that always keeps death by his side and just lives each day. Han Seo Yun is a girl suffering from anterograde amnesia, and unlike Kim Jae-won, she is someone who always exudes positive energy even while battling an incurable disease.