This drama reminds me of two others : Manhole and Go back couple. However, even though those two dramas had a solid plot and purpose of why they were made, this drama failed to deliver. I'm not concerned on it not being original. If the plot is good, why not watch it again with other characters? The main minus, however, that I've found is that the drama pretty much finished in episode 12. The rest of episodes were some unreasonable and meaningless plot twists, happy ever afters and just cute family life. It felt like the writers didn't know what to do with their story and just rushed to add something to fill the hours that were remaining.
Part from that major setback, the performances by the cast were great by all the actors and actresses and they pulled it off nicely. Also, the drama up to the 12th episode, was very good and interesting.