Powerful opener. I've always been intrigued by the concept of time travel; I knew I was going to watch this drama even though I didn't know what to expect. But I saw the opening scene with the flying ships/drones, outfits, and I knew I was wholly and utterly in even before the start of the dialogue -- outstanding directing. The pace is just right, the acting, the storytelling -- just brilliant all around. I felt like I was watching an American movie rather than a drama. I didn't realize how much I had missed Kim Hee Sun until now; I loved her in Faith. Kwak Shi Yang looks excellent as well. But Park Jin Gyum stands out the most, it's only the first episode, but he's stellar. Finally, I wanted to mention how impressed I am with child actress Kim Ji Yoo, and actor Moon Woo Jin, future stars in the making. This is one of those shows you know from the first episode you're hooked.