This sentence broke me. I don't think I've cried as much as I cried watching this series. Everything about this kdrama is absolutely beautiful. It isn't only about your first love but also your first heartbreak, growing up, facing hardships, working hard to chase your dreams, building meaningful friendships and enjoying your teenage years. The ending was absolutely heartbreaking but also realistic because life doesn't always work the way you want it to work. I loved all the characters and the summer vibe reminded me of Twinkling Watermelon (one of my favorites). I loved all 2521 songs!!!! Seungwan was my favorite character and it was sad because she deserved a better ending.