My first k-drama, and one I revisit periodically. The storyline is original - a man destined to continue living to atone for crimes in his past. I'd like to address the age difference - I can see why some people really had a problem with it, especially since she spent so much time in a high school uniform. However, the chemistry between Gong Yoo and Kim Go Eun was amazing. When watching Gong Yoo - his loneliness was almost palpable and was heartbreaking to see. Kim Go Eun was able to vacillate back and forth between her pitiful life and her vivacity as she gets to know Kim Shin (Yoo) better. The secondary love story between Lee Dong Wook and Eu In Na was lovely as well. There was a lot of humor (like when he told her his name was Kim Woo Bin!), but such sadness as well. The scenery is just beautiful when they are in Canada. The music is absolutely perfect. Each song fit perfectly where it was used and there was a haunting quality about a number of the songs. These songs are easily recognizable when you hear them outside of the show. But I think the thing that I love best about this show is the friendships between the characters, especially between Goblin and Reaper. If you look up the word Bromance in the dictionary, you should find their pictures there - what started out as hate, moved to grudging respect, and then finally brotherly love. Their scenes never failed to make me laugh. This is one of the few shows that I have watched multiple times, and have enjoyed it just as much each time.