You can't have the guy who's literally winning during the entire show (Nam Do San) also win in the end. There's literally no depth to the plot. Seo Dal Mi likes Mr. Nam in the beginning, and she doesn't even seem to show any interest in Han Ji Pyeong, all the way throughout the entire show.
And why is Nam Do San such a hate-able character. Decent idea and delivery spoiled by the laziest plot I've ever seen in a show of this "quality".