From the very first scene, LOVELY RIVALS travels at a neck break pace and never lets up. It's funny, unfocused, silly, slightly perverted, bizarre, surprisingly deep and in the end heartwarming. I'm not even sure what to think of it, but I think I liked it. At one moment it's fucking silly as shit and just a few seconds later it deadly serious...very bizarre style of storytelling. Overall, I wish the film had been more focused and the ending not quite as predictable.
Enough about the story, let's get to the acting: I really enjoyed everybody involved. I usually hate movies with kids in it, but all of these kids put in believable performances. Very impressive. I also really liked the two adults leads. Another favorite was the headmaster. He was only in a handful of scenes, but he was really great.
If you're into Korean cinema and are looking for something lighthearted and enjoyable then I say it's worth a watch.