To be honest, I don't think a lot of people will grasp the magnitude of how powerful this movie is at first watch. Heck when I first watched it I was all like "HUH?" and did not even both to watch closely. I would've rated it a 7-8 at first. But on the second time around when I really paid attention, it was just so much more in depth and powerful than just friendship or love. The relations between the characters, the nature of each character, the impact that one character has on another, the emotions that flow through them and their actions... I can't even explain it properly but just know that this movie did not become a huge Korean hit for no reason.