"More than the story, it's the characters that matter" : this sentence can summarize the essence of drama; The story is focused on the development of the situation and the feelings of the characters. It is more focused on love, but it also deals with taboo subjects in Korea (and throughout the world as well) such as single mother, the death of one's lover, sex, cheating, homosexuality... It's NOT BORING, even if it is simple, the story is really exciting.

LOVE : the writers depicted love in a very fair way. It seems real.
FRIENDSHIP: the same sense of reality ! It's a healing drama for that.

The acting is amazing, perfect... all the actors of the drama have a real talent on screen. Usually, in k-drama, there is always at least one actor whose character is ridiculous, poorly played (most of the time a supposed-to be funny character). But it's not the case !! I was really impressed by the overall quality of acting;