There are some aspects that I'm not a fan off, for example that she didn't discover that he was Do Hyun Soo herself and only found out when he was coming off the anesthesia. I also felt the amnesia was a little unnecessary, I understand what they tried to do with that: a new beginning in which they can choose each other freely. But for that we'd need more scenes of them instead of the angst being dragged until we only had seven minutes to make us believe they found their way to each other and everything worked.
I felt it was unnecessary and it took time away from other scenes between them that could've been more meaningful, a good example of them choosing each other again could be marrying once again, this time with his own name, and with his family (his sister and his friend, and also Eun Ha and his mother in law, of course) present.
I didn't hate it because the angst of them brushing fingers with the rings on and him not taking it off was *cheff kiss* but after all the previous drama I wanted more fluff of them "after the storm" for the final episode.
The story overall was interesting, it was a little predictable at times and I think they could've made some of the characters more complex, but I liked what they did with the main couple and some of the secondary characters.