Rating this show is extremely difficult. On one hand it's been such a long time since I've seen a kdrama that I enjoyed so much. It kind of recaptures the feeling of some of the greatest kdramas I watched, when I started the Asian drama watching hobby. (Lover from the Star, Secret Garden etc..) However the -2005 era-ish - love triangle is annoying on multiple levels, even though it's not the most frustrating one I have ever seen, it leaves a sour taste in my mouth. Also the writing is not only inconsistent, but also multiple annoying cliches are used, such as falling onto lips, weird relationship contracts, agree to go on 3 dates with the ex, getting filmed by bystanders at an opportune moment etc..

Onto the good things, I think the cast is great, the leads have increasingly great chemistry as we go along & while the special abilities are a bit underutilized, they add a nice flair to the drama. There is a lot of charm going on across the board, it really often feels like I'm watching art, not a technician's work. The office life part of the drama is above average, there are some kdrama specials of course, but it's usually far worse than this.

As for the ending, I detracted an entire point from my rating due to the last two episodes. Up to episode 10, this is a flawed, but very entertaining fluffy romcom, however that's followed by 90 minutes of flashbacks & the big crisis of the drama, this part held very little interest for me & while I was waiting for the inevitable happy ending the last 20 minutes happened. If this was in episode 7 I would have loved it, but before a 10 seconds happy ending? Heck no, what were they thinking? I guess this is what happens, when the production team thinks they don't really need an established writer, since it's a webtoon adaptation. They were mostly right, except the webtoon is ongoing & season 1 ended with a cliffhanger & the writer did not spend enough time to think up a reasonable way to give us closure. Though with adjusted pacing it could have worked, who knows it might be 90% the editing's fault, after all the audience has no idea what ended up getting cut..
Then I again I'm not sure if I blame them, this is a long ongoing trend in kdramas, the production team doesn't care much about the last episode, because it does not influence the drama's success, people already watched the product placements, it's not like you need the audience to come back for another episode, right?

edit: I should give more credit to the writer, yes she has botched the ending somewhat, but the drama's plot is better than the webtoon's in my opinion. (usually the reverse is true, see Secretary Kim, Business Proposal)