This is a slow, well-paced show. Don't expect lots of action when you read it's a time travel fantasy. The writers took their time developing the characters and the story and it was pretty enjoyable being along for the ride. Though I didn't love it, I think it was worth watching, for various reasons.

Writing: GOOD: A very good story. There was tension throughout, never knowing what was going to happen next, and just when I thought I'd figured it out, the writers threw in a curve ball. I especially loved the characters of So Joon and his friend Kang Gi Doong. So Joon was a man that, by necessity, lived a pretty solitary life, and I thought it was wonderful that he let his friend in on the secret and his friend always had his back. I liked the concept of the butterfly effect - one change that you make in the present affects the future. I also love the fate aspect, meeting in the past and again in the future. NOT SO GOOD: I did have trouble, however, keeping track of past, present and future events, which often took me out of the story. Often there was not clear delineation to give you a good idea which timeline you were in. I had a difficult time with the reason for the breakup, I felt it was weak. And not to give anything away, but if you know something is going to happen at a specific intersection at a specific time, why not just avoid the intersection? The secrets went on too long: "I have things to tell you but I can't tell you and you just have to trust me for awhile."

Acting: GOOD: Lee Je Hoon did a wonderful job. He had to display a wide range of emotions and I always felt he was believable. He started out just being self-absorbed, not wanting to get involved in anyone else's life. As the story progressed, you could see how much he cared for others. NOT SO GOOD: Shin Min Ah is a good actress, but when she gets upset, she overacts. I found it hard not to laugh during her over-the-top crying scenes. And when her voice went up an octave when she was trying to be cute/sexy I just had to cringe.

CHARACTERS: GOOD: So Joon. Good progression of his character throughout the show. NOT SO GOOD: I did not like the character of Ma Rin at all. First, the woman seriously needed to start going to AA meetings! She had a real drinking problem. That was not enjoyable to watch. I felt her character was pitiful - she was trying to start a business, but she was just so sad to me. She seemed to always be listening to other people's conversations and going where she was not supposed to go. I felt that she was pushy and clingy with him. I didn't find anything endearing about her character.

CHEMISTRY: So good!! There was more hugging, hand holding, etc. than we normally see in K-dramas, and they seemed like they were really comfortable with one another. Some of the touching scenes gave me the feels.

OST: The music blended well with what was going on in the show, but there weren't any songs that I absolutely loved.

So, in conclusion, I'm glad I watched it, but I can't highly recommend it. It's one of those "filler" shows when you've watched everything else and are waiting for new shows.