Let me start by saying this: Soo Ae & Kim Rae Won are two of the most talented actors I've ever had the luck of watching on television or film - from any country! What they were able to bring to the characters of Seo Yeon & Ji Hyung [the passion, the anger, the devotion] was breathtaking. You want an example of perfect chemistry? Watch the two of them. The story sheds light on the struggles of both people with Alzheimer's & the ones who love & support them. I'm not going to lie: I cried pretty much every episode; six times during the finale alone! The performances were so stellar & human. Not once did anyone go over the top. And I can't finish without mentioning Park Yoohwan! If we could all be so lucky to have a sibling as dedicated & loving as him. Such a fantastic actor! ***I gave the show a 10 in re-watch value, but I'm actually on the fence about re-watching it again. It was so unbelievably beautiful, yet emotionally taxing that I think I'd need to pace myself if I ever did decide to watch it again.