The first part of the story is really good! the love story is well written and acted, but for the hole conflict part of the drama they leave all to her evil mother, which is not enough to maintain a good argument for more than 2 episodes, imagine having to drag it along for 7!!!
Apart from that, we have a strong confident woman that supposedly stand up for herself, that loves this young man, and instead of being there for him like he did when she needed him, she acts like a total BS and disregards his feelings towards a man that abandon him and his sister, she MAKES him do something he does not want to do, just like her mother is doing to her... (guess the apple doesn't fall to far from the tree)
And after everything he did for her, he asks her to go with him to the US and she not only disregards his feelings ones again and rents an apartment without even telling him, but while he is away he starts dating some guy just to please her mother... wow! I mean... WOW
AND! to put the cherry on top of this whole Jin Ah 100% egotistical story line, Joon Hee is the one having to take all the responsibility at the "nothing but a pathetic excuse of a grand finale" they tried to pull in the last 5 minutes of the show so they would end up together...