As someone who watched both the series and the movie, I have to say I enjoyed the series slightly better overall because the main characters seem to have a lot more chemistry. Even in the cute moments in this movie there didn't seem to be any real sparks or that moment of "pow".
Still the series had issues that I felt this movie did not have, with the ending being rushed and ambiguous. I liked that they also gave the female lead more skills and that he wanted to create a show about her parents love story.