This Drama was badged "OCN Romance", a nice reminder that OCN doesn't really focus on romance Dramas. It kinda showed. The story itself was pleasant, but the strongest moments for the OTP(s) were the sad moments. They were the sceness that made me feel most strongly.

Part of that was the overly-elaborate time travel recursion. I have absolutely no problem with shows that don't bother trying to come up with an explanation for time travel, because there isn't one. As the Doctor said, it's all just "wibbly wobbly, timey-wimey stuff", so Dramas can cook up whatever explanation they like, or none at all, which is how this Drama handled it. But I think the writers got a bit carried away the idea of Inception-style layers upon layers, like a Matryoshka doll version of the Matrix. The intricacies took some of the gloss off the OTP and made it easier to focus on and cheer for the single-timeline stories. The boy who became a celebrity so that his crush could call him Oppa was my favourite of those.

Overall, by no means an awful Drama, and it did have the virtue of being short, total runtime well short of 9 hours. I've definitely sat through much worse.