Let's break some facts first and extra slight spoilers. No need to worry!

1. Nothing irritates me as much as Lee Gun's hairstyle in the first half of the series.
2. Pointlessly long journey to the happy end.
3. Episodes 14, 15, 16 and first half of ep. 17 are practically empty. No need to watch it. (I've done my nails during that time.)
4. Daniel is the only one likeable and straight thinking being.
5. The plot is extremely fabricated.
6. Miraculous outburst of emotions towards FL is unreasonable. Especially after 6 years of devoted waiting for Sera.
7. Sera is not a negative character.
8. Exaggerated emotions and overreacting regarding pregnancy.
9. Acting is actually really good.
10. You will laugh many times.

The story is the basic, the story makes 50% of the whole series/movie. And this drama was not something that makes me come back to it. I am actually surprised I've been able to finish it, despite the fact, I've had to skip some parts and that's something I've never done before at any drama.

Overall: Not great, but not bad either. So yeah, give it the chance to it.