Again if you just take it as a all then they don't have much in common if just the amnesia part. Ji Hyung is engaged to a woman chosen by his family, but he loves Seo Yeon, who he has been dating for years with the understanding that their relationship would last only until Ji Hyung’s marriage. The wedding date is set, the two break up, heartbroken Seo Yeon starts to forget things, first just the small one but its soon escalate to more important things that alarm her. As Seo Yeon’s memory loss becomes more severe, she learn an life shattering true and Ji Hyung must choose.