Acting, actors, chemistry, story line, cinematography, build up of characters, character relationships, perfect score. They made us cry, made us laugh, tears of joy, melted our hearts with sweet momments of every relationship-lover, brother, parents, bestfriend, workmates, patients, etc.. They amazed us with their acting! Here, you'll understand their actions and its not annoying and unreasonable. The best and the most relatable k-drama for me. 5 stars indeed!