Let me start off by saying this is the single first drama I have liked in a very long time. In fact, It's been the cure to my years-long drama lag all together. I've learned my lesson to not listen to drama 'hype' anymore so when there was a lot of attention surrounding this drama I didn't give it much thought. So perhaps it was the fact that I didn't listen and was pleasantly surprised or that for once a drama really did live up to the hype. Either way I loved it. The story was very original. What kind of a person thinks to match up a 400+ year old alien with a Hallyu star? I don't know but they are wizards or something because their chemistry is like magic. The acting was also great! I wouldn't expect less from Kim Soo Hyun. That boy knows how to deliver. Jeon Ji Hyeon was also amazing. I've only seen her in a few things but I'm definitely a fan now. The music was good. It didn't really stand out from other drama music, but it definitely fit very well into the scenes. I would definitely rewatch this. And then rewatch it again.