Even though they're all new characters I've watched, after a while, it feels like they've known you for years, for some reason in these Korean dramas. It was a very sincere and emotional series. I advise. Addiotinaly i liked original sound tracks. It was amazing story. I could watch again if i would. Anyway you should watch this series absolutely. First of series, i couldnt like actors and actresses but for a while i got used to them. First and last episodes was so interesting. I don't want give any spoiler. You will see when you watched.