I have watched this drama completely . The actress SEO YE-JI and actor KIM SOO-HYUN acting were perfect for their role . The journey of healing and learning of each of the characters from the main leads to the various patients is very moving. Admirably tasteful way to deal with mental and emotional issues on screen. The central love story is so involving because their pain feels profound. The incomparable Seo Ye Ji as writer Ko Moon-young is unforgettable - strong and vulnerable, finally a real step forward for K drama heroines. Enjoy each sentence she utters in her signature low voice. She has some memorable and often hilarious dialogue. A far cry from the Cinderella type heroines of early melodramas. And her outfits are stunning - perfectly suited to her tiny waist. Kim Soo-hyun is well cast as caregiver Moon Gang-tae. He isn't a larger than life hero but instead a man with pain and burdens. He looks more mature here. The pairing of the two leads is right. Oh Jung-se gives a likable convincing performance as autistic Moon Sang-tae, In less capable hands the character could have been annoying or tiresome but he made the brotherly relationship very touching. The production values are very high. From the well integrated animation of the stories to the quirky Tim Burton style house, it all has a high quality feature film standard feel to it. To cap it all off the ending is a good and satisfying one. Really there is no need to find any error. I randomly chose to watch this drama. But I found it amazing so I continued watching . The more episodes I watched , it became more and more thriller. As many episodes I went ,there were suspenses. At some time the story had a mystery which was solved at last. Make sure to watch this drama .