This drama is great, except for one important thing. The writers made a promise at the beginning that they didn't deliver on. By making us fall in love first with the guy who doesn't get the girl, it made the ending unsatisfying.
Of course, it was a twist, and they tried to make the guy that gets the girl as likeable as possible, but still the viewer had already fallen in love and sworn loyalty to the first guy we were made to relate to.
Strangely, the chemistry between those who ended up together was not quite there.
All in all, Do-san's character was lacking. Ji-pyeong's character was much better written. It feels like the writers changed the ending last minute and made the other guy get the girl to make it "interesting" BUT there was no reason to reinvent the wheel. The wheel is perfect and still relevant today for a reason.