If I were a betting girl I would bet that the director and/or some of the writers are the same for Princess Hours and Boys Over Flowers. There are strong similarities in the score, the abrupt transitions, and in the characters such as the over-the-top goofiness yet lovableness of the female lead, her quirky but loving parents, the adorable little brother, and the second male leads orangish hair. Fortunately, these are all points that I love about both dramas.
Princess Hours is worth your time to watch. Enjoy!