I don't know where to start. This drama was so overwhelming. The plot was so deep yet so complicated but if you really focus and think about it, you'll understand. There are some loopholes in the time traveling and character shifting situations but I think the overall goal was certainly made clear. The acting was superb . so much emotion and the OST certainly meets up to standard. The OST is probably the second if not best thing about this drama. I have every song saved in my playlist and it's so nostalgic and surreal. This is more considered melodramatic and that's what makes it heartaching yet lighthearted and sweet. I highly suggest you try out this drama, i can guarantee it won't let you down. A big hands to the actors and actress I haven't been so impressed in such a long time.