I'm quite shocked that almost everyone is rating this at 10/10. I mean sure it's a drama that is worth watching, but it's not overwhelmingly great. I'm fine with romantic comedies having absurd nonsense stories, but CLoY is not supposed to be just a romcom, there are times when the the show takes itself very seriously and there is supposed to be quite a bit of impactful melodrama. I feel that it does not quite work.(the serious melo parts) Maybe it's because of the cartoon villain style adversaries, or because of the 4 idiots in the second half I just cannot take the sad bits seriously. Also the drama was much better in the first half, I think there was no need for the idiotic plot that commenced once Seri has returned to the South. I have seen people discussing how many details they've gotten right about the North, there were even some real north koreans refugees interviewed. I'm sure they've gotten many minor details right and that's laudable, but there are just so many absurd things, let's not even get me started about product placements..

Anyway I enjoyed the comedy, especially before they've gone to the South. The romance between the leads was so so, I don't think that the Hyun Bin+Son Ye Jin coupling was a particularly good choice. I think Hyon Bin was a lot better in Secret Garden and Son YeJin also did much better in Something in the Rain. Don't misunderstand I do think that they did a decent job at their characters, I just did not feel the same authenticity, or the chemistry that they've had with other actors in the past. I must admit that Seo Ji-hye was incredible as Seo Dan, I'm looking forward to seeing more of her in the future. As for Alberto Gu, well I'm not sure what was the deal with him. For starters he did not have a lot of screen time, nor did him dying serve any meaningful purpose. I mean sure I did enjoy the ~20 minutes he spent with Dan, but it feels like he was the redshirt that the writers used to make a bigger impact for the ending. Ah yes, the ending, they just had to go with the forced separation for 2 years formula, not the worst, but not great.

The production quality was on an extremely high level, they had a really high budget & used it well for the most part. I found it incredible that they've even used anamorphic lenses in the pilot episode. The anamorphic look really worked too with establishing that authentic war movie vibe.
The music is a mixed bag, on one hand they've made some amazing OST tracks for this show, on the other though the director did not do an amazing job at arranging those tracks to fit the scenes particularly well.

edit: Hyun Bin and Son Ye Jin as of now are supposedly dating in real life. Despite me not liking this pairing in this drama too much, I gotta admit their behind the scenes videos/bloopers showcased hugely more chemistry than their actual scenes shown in the final edit..