My Lovely Sam-Soon (2005)

It's Christmas-time and klutzy Kim Sam-Soon is nearly thirty years old, overweight, dumped by her cheating boyfriend, and out of work. After an embarrassing first meeting with arrogant restaurant-owner Hyeon Jin-Heon, she is employed as a pastry chef. Sam-Soon and her younger employer are equally stubborn and opinionated. The pair often argue, but Jin-Heon asks her to pretend to be his girlfriend when he wants to avoid his family's matchmaking. Things get more complicated when Yu Hee-Jin --the pretty ex-girlfriend Jin-Heon still pines for, returns from America with handsome Dr. Henry Kim.