I originally started watching this drama because I wanted to watch something with Moon Jo won, being one of my all time favorite actors this was a must. But I cant deny the disappointment. The reason why I am disappointed is that everything else was stunning and amazing (but the story itself). This drama really had potential but it went downhill. I am not sure why every time kdrama writers try to dabble in Sci-fi fantasy it turns to a whole mess. The story started off somewhat illogical and I tried my best to follow but it only kept getting weirder as it progressed (especially the ending) and I couldnt really understand what the hell is happening half of the time. Is it time travel ? is it different dimensions ? how do people end up connecting with their selves of the past dimensions and having their memories. The doubleganger theory made no sense whatsoever. Is the FL his adopted sister ? mother ? love interest ? I couldn't wrap my head around it, I kept thinking whether it is a really smart story thats beyond my comprehension? I couldn't tell. Towards the end I really stop caring about the story and stayed for joo won's acting, which is as usual, stunning. I didn't think I'd be this sad since I didn't really connect to the story as much but I actually cried . Music is good also VFX. Overall an okay drama that could've been tied better in its theories and topics.