The story line of this drama/sitcom wasn't the best, I did want to know more about it but couldn't be bothered to watch all 10 episodes- the only reason I kept watching this is because I'm a fan of Choi Minho (I'm guessing 98% of the watchers are Shawols, just like me). The actors couldn't really do a good jobs with this drama, I've seen many of them in different movie/dramas and they were great- it's just that they couldn't do anything amazing with the badly written story line, non of the characters were realistic and that annoyed me. Honestly, I wouldn't recommend you wasting your time with this drama unless you are very, very, very (and I mean extremely) bored.
The story is written so well, the first season is better though. Sun Hee was very immature and there weren't enough scenes with the baby- the drama didn't really portray teenage pregnancy very well. It was funny and there were some episodes where I couldn't wait to watch the next episode. Would highly recommend watching this drama!