This is one of KDrama's best series with two fine actors in the leads. Yoo Ah-In was actually several years older than the age of the character he plays, so his capturing of the gawkiness and hesitancy of the youth is particularly noteworthy, as is the character's gradual maturing and literally taking the lead in the relationship. We also must compliment the actors' memorizing the piano pieces. They and the professional OST are amazing. I could have done without the side plots as I just wanted the love story because it is so touching.