This movie is seriously underrated. Nobody seems to know about it even though Lee Byung Hun is the male lead. I hope that with this review a few more people will decide to give this movie a try. Let me start with the plot. You could say that this movie is devided into two equally long parts. The first one focuses on the development of the relationship of the two main characters, and the second one shows the situation of the male lead 17 years later. You could say that the real story only starts with the second half of the movie and for people who are not into light romance movies, the first half of the movie might seem really draggy and uninteresting as it only shows selected scenes of the couple and their relationship, but believe me, every one of those scenes is necessarry to understand what happens in the second part of the movie and why exactly the main character falls in love with one of his male students. And let me tell you, this is not a gay movie! It is true that "gay" becomes a subject at the end of the movie, but that is not what this movie is about. This movie is simply about love. About endless love. I don't know how it is for most people who saw this movie. I've read other people's opnions about the ending, but I don't agree with most of them. Some just didn't get the message this movie was trying to deliver. It was not about society and gay people and the "curse" of loving the same gender. Absolutely not. This movie was just about how much love effects you and that it is possible to find your soulmate. This movie is about an undying love that no matter what will never fade. The characters and the actors were just awesome. I can't really put into words how much I loved the male main character and the way he changed after 17 years, but his love for her never died. It was also increcible how the second male lead (who becomes his love interest in the seconds part of the movie) resembled the female lead, but was at the same time so different. This movie is just the best and people who like complicated but sweet romance stories should definitely give it a chance. And yes, I really think that this movie is sweet, despite the drama and tragedy that seem to happen to the male main character the whole time. I've watched this movie a lot of times already, but I could still watch it over and over again and love it just as much as I did the first time I watched it. Just one thing: Don't drop the movie before the "17 years later" part begins. You will love this movie, believe me!