This show has good cinematography, consistent excellent scene writing, and humour.

I thought after reading that there would be repetition of time travel many times which would make the story repetitive so it would end up boring. Turns out I was wrong. There were 4 times of time travel to the past, but 3 of them came to different times. The fourth (last) is just a flashback. The story telling in the future is also the same, the 4 futures have different situations and atmospheres.

There are some minor plot hole.
From that time travel situation.
But just minor plot hole.
And, Its typical Rom-com fantasy drama.
What do you expect?
Some minor plot hole sometimes necessary too exagrate the scene.

As long as it serves the purpose it was created for and fulfills its function and is "served" well as a rom-com. I won't expect more, let alone go beyond their's goal.

Watching this, I was giggling in my room while blushing at the scenes in each episode. This drama is one of the rom-com dramas that I rarely "fast forward".

I personally have watched a lot of rom-coms, this drama is one of the best. All scenes are presented well. There are many romcoms that try to be funny and want to depict a romantic atmosphere. But they failed miserably.