This is an easy watch, great visual quality and evenly paced. I enjoyed it. The destiny, fate aspect is well thought out with explanatory flashbacks at the beginning of each episode. The story bears a striking resemblance to You Who Came From The Stars and I suppose that's because it's written by the same screenwriter.

Jun Ji Hyun is fantastic as always in the lead role, her comedic bent is so natural and never overdone. Lee Min Ho was surprisingly good, although his delivery seemed forced in the emotional scenes. The two of them together have passable chemistry but Lee Min Ho doesn't seem able to take emotional and poignant scenes beyond a certain point, many of them came off as playful and bantery, if that makes sense.
Jun Ji Hyun is far and away a superior actor and there is a definite imbalance, I got too much superficial humour from him and a mature, emotional resonance from her, hence the mismatch.

The supporting cast is good, villains are weak and the secondary loveline is barely perceptible. I did enjoy the backstory and it was well exposed.

This is a good drama with all the elements required to make it a blockbuster, but overall for me it lacked punch and didn't grab me enough to give it a higher rating.
Still worth a watch.
Music is good, although not memorable for me.

Overall score 7.5