A Thousand Days' Promise (2011)

the leads in both film confess their feelings, make up for their mistakes and try to use the remaining time well after they know that one of them has a terminal illness.

Both couples go through a lot to be together and face an illness.
(BOTH ARE REALLY SAD).
Have a box of tissues ready

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.

They both deal with the subject of lovers dealing with early memory loss and how it effects their relationship. Both are melodramas and acted extremely well. Heart tugging and lovely if you are in the mood for melo. Nicely done.

Both dramas are about Alzheimer's disease. In The Wind Blows, it is the male lead who's suffering from Alzheimer's, whereas in A Thousand Days' Promise it's the female lead.

Both drama deal with Alzheimer's disease and its impact to the patient and their surroundings. They both focus on the emotional impact along with relationships before and after the diagnosis. While Memory focuses more on familial love, A Thousand Days' Promise deals with more romance.