It has an angry core, a heart of anger that resonates with the viewer because the source of that anger is something real, something that has probably happened to all of us.

The movie is about four juvenile delinquents who rob a gas station. Twice. Just because.

At first glance, they seem like four nobodies. A bunch of losers who weren't brought up right and now they steal from working people who earn their money. However, a deeper examination reveals that these fellows are not losers, not by a long shot. Each of them is talented and has something to contribute, but they've been cheated. They've been cheated out of the livelihoods, the destinies they were promised by an imperfect and indifferent system.

And so, in attacking the gas station, they right social injustices that in small ways mirror the injustice so cruelly bestowed upon them.

The movie itself is priceless. Each character is brilliant and rich. From the failed baseball player turned gang leader No Mark (Sung-jae Lee) to the cowardly, self-centered gas station owner (Yeong-gyu Park).

The gang of punks waste no time in not just robbing, but angrily attacking and destroying the gas station. After the first robbery, you'd think the gas station owner would invest in a security system. A few cameras, maybe an alarm? No. He's too cheap for that and, instead, resorts to hiding the money.

When he's robbed a second time -- by the same quartet -- he makes excuses about why he has so little cash. So, the delinquents take him and his employees hostage and decide to work the gas station themselves and pocket the proceeds.

Oh-seong Yu plays Bulldozer (Mad Dog in the American version) who guards the hostages. He dispenses justice by threatening the unruly with the high school punishment of making them balance on their heads and knees -- or else get whacked with a hockey stick!

"On your heads!" quickly becomes a hilarious recurring battle cry that Mad Dog bellows in response to disobedience or disappointment. I

Mad Dog is definitely the best and the funniest character in the movie with his charming, simple nature and his single-mindedness.

As funny as the movie is, each character is haunted by a troubled past. Each of them plagued by an innocence lost.

Let's put it this way. When you were a kid growing up, did anyone ever ask you "What do you want to be when you grow up?" As if it were just that simple. Pick a career and do it. Fireman, policeman, paleontologist, doctor, race car driver, or president of the United States! Whatever you wanted, you could do.

How old were you when you realized it was a lie? Only rich people can be doctors. Paleontologists don't work with dinosaurs, they dig holes in the ground and lecture to bored college students. And police officers work a grueling, thankless job only to end up with failed marriages and broken families.

Each of the four robbers have broken dreams, too. Whether they want to be baseball players, rock stars or artists, each of them had their dream thrown back in their face by a society built around greed and indifference.

Ji-tae yu who plays "Paint", angrily tears down government propaganda posters about how rosy life is. You can feel his anger, and when you read the signs and look at his life, you share it.

The final scene is priceless comedy, but also a chilling metaphor. A parking lot full of Koreans who were beating each other senseless a moment ago, now coexist only under the threat of mutual destruction. How appropriate.

And all because a couple of bored guys decided to attack the gas station. "On your heads!"