Ku Dong's life is going nowhere, spending his days beating people in the streets, he seems to be confined to repeat the same mistakes of his father, who happens to be already in jail. Even his younger brother is not far from going into the same tracks. Then a struck of luck, if you could call it that, hits Ku Dong, a crime syndicate kidnaps him in order to train him to pass the police admission exam. It's something they have been doing for a while, sneaking moles in the police force to protect their leader, and making it easier to do dirty jobs here and there. The training of Ku Dong is both painful and hilarious, a very black humour that seems to be something natural for Korean cinema The thing is, Ku Dong really wanted to be in the force, at first just as an excuse to keep beating people, but eventually starts to realize this is his chance to give his life a real purpose.
"I thought I might be using a lifetime's happiness in a moment. I was that happy and she was that beautiful." A young boy stands on the red earth of Australia under its blue sky. It is 17-year-old Sakutaro Matsumoto. His time with the girl comes back to him. The colored sand runs through his hands and a tear appears on his cheek. He wakes up. It's 2004 and he is 34 years old and in Japan. He thinks "I have been in a world without her for 17 years." Returning home to see his old high school for the last time before it is demolished, Saku confronts anew the loss of the love of his life, Aki, to leukemia 17 years ago. Now a medical researcher at graduate school, he has been living as if half of him died with her since then.