I loved this show the whole way through, even though I heavily relied on the subtitles. You can’t look at this show from a scientific perspective as there’s so many flaws but seeing as you’re working with an impossibility ie, time travel that’s always going to happen. However looking at this as what it is, entertainment, it delivers for me. I enjoyed all the characters, the story the awkward romantic pairing (if you can call it romantic). These Korean dramas are always fairly tame, which in some respects is quite refreshing.
I have read some poor reviews in relation to the script vs the science. The only disappointing thing for me was the ending, which made absolutely no sense at all given what had occurred no more than a few scenes earlier. A pathetic nonsensical ending. I still loved the show, if only they could somehow make the ending work. Oh well, can’t have everything! Unless of course you’re in a Korean Drama lol