I really enjoyed this drama.  Lee Jong Suk is wonderful as Jung Jae Chan.  Suzy does an admirable job as Nam Hong Ju - a lot of people like to bag on Suzy, which is unfortunate.  She's not the strongest actress out there, but I think she shows steady improvement and this show was no exception.  I especially loved hers quip with Jung Hae In's Han Woo Tak - their chemistry was delightful and that it was much more a "friendship" chemistry really keeps it from being Another Second Lead Syndrome kind of show.  And Jung Hae In... man, I just want to shrink him down and carry him in my pocket for sad, rainy days. He stole every scene he was in. There were a host of actors in this show who often play supporting characters or guest characters and whom I always enjoy.  The strength of the supporting and guesting players really rounded out this show for me.  I freely admit that when I first heard the title, I was sort of expecting a remake of the Sandra Bullock movie (which, hey, is one of my favorite rom-coms, so that wouldn't have sucked), but I'm actually really glad that it was not.  This premise could easily have gotten bogged down in what-ifs and paralyzed inability to act because of "destined outcomes," but the script deftly avoids those pitfalls.  I loved how intricate all the connections were.  The last episode was all the feels all the time. All in all, this was a really sweet show.  It had just enough suspense and set-backs to keep me guessing sometimes, but was never so bogged down in complications that it felt oppressive.