My Lovely Sam Soon (2005)

Kim Samsoon is a baker who has a talent in making pastries and cakes. On Christmas Eve, she caught her boyfriend, Min Hyeonwoo, cheating on her and breaks up. On that same night, she accidentally went into the men's restroom and met Hyeon Jinheon. By sheer coincidence, Jinheon needs a baker for his restaurant Bon Appetit and Samsoon is unemployed. Samsoon is hired as the restaurant's chief baker and the two fight like cat and dog.