I usually don't care for spy stories - by the 4th or 5th episode the plots get so convoluted that I lose track of what's going on and by the 6th episode I just don't care any more. But because hope springs eternal, I gave this a try and I'm glad I did.
First, I am a fan of Im Joo Hwan. He tends to end up in second lead roles, especially if the role is evil or generally a horrible person. I was really pleased with the complexity that was written into this role for him, and as usual, he delivered a lot of misdirection as to whether he was a good guy or a real scum. The ending for his character was totally satisfying for me and worth the watch.
I liked Eric Mun more than I have in the past. And Yoo In Na was a nice surprise - although she is pretty active, I wasn't really aware of her before, but she got my attention here. Overall, the cast and the acting were excellent.
The story had enough twists and turns to keep me bingeing, but it never got overly confusing. Easy to follow but engaging - that's the best! I didn't actually notice the music, so on one level, that's a good thing, since I really hate shows where the music seems to want a starring role.
Overall, a good watch, nice for bingeing. Nothing record breaking or earth shattering, just a good solid K-drama rom-com. Which is no small thing.