Park Ji-hyung and Lee Seo-yeon are as different as fire and ice. Having grown up as a respected doctor’s son, Ji-hyung led a life of success and comfort. On the other hand, for Seo-yeon, life was a continuous battle against one obstacle after another. While they fall in love with each other, Ji-hyung decides to marry Hyang-gi, a girl chosen by his parents. However, when he finds out that Seo-yeon’s got Alzheimer’s’ disease, he decides to stay with his love through her dark times.