Well, if you're looking for a drama to keep you hooked from episode 1 to the very end, this is your drama. My god. From the short description on this site, I was not expect so much from this drama but geez did it keep me hooked for a few days. This is also coming from a person who barely watches melodramas. Story | The whole doppelgänger scenario where something happens to one so the other fills their place. There's also love, loss, family drama etc. The whole works. Story may be a little confusing at first. It goes back and forth through time to explain situations later on. Also give you a headache from trying to guess what is actual and what is not. Cast | From the main roles to the supporting roles, I loved everyone who was casted. I haven't watched Ji Hoon in a drama since Goong and it was weird seeing him with this serious role at first. But his acting was superb! His character change was natural and nicely paced. Him and Soo Ae were great together. I liked their chemistry but at times I felt like there was more emotion from Ji Hoon's character and it didn't match Soo Ae's as well as I'd hoped. Even so, I loved them as the leads. Jung Hoon and In Young were simply fantastic! Their acting/chemistry together was spot on. And you know an actor has done their job when you can't fully hate or love their character. Supporting cast was great too! Family, friends, loan sharks etc I loved. This drama has me waiting for the day when Hoya gets a lead in a drama. And just have to say, Min Woo's assistant was by far the best supporting character in that entire drama. Music | Besides the instrumentals for scenes, I don't remember much so my score is low. Rewatch | It's hard to say. There was much suspense in this drama that it'll be hard to watch again since all the twist and turns won't be as surprising. One day I know i'll come back to it because I seriously adored Ji Hoon's acting but as for now, probably not. That's the only reason my score is so low. Overall | Honestly, maybe the best drama for 2015. I loved it. Truly. I had so many emotions while watching, god..it was terrible! So many twists and turns to keep you into the story. At some point you may think "ok, really. more?" but I was honestly ok with all the back and forth-ness of it all. It made 20 episode go by fairly quickly and though some may say it dragged, there wasn't a boring episode in this entire drama. Give it a try, at least the first 3-5 episodes.