Story follows four young men who have just turned 21 years of age. Lee Choo-Won (Seo Jun-Young) is an athlete who can not forget his past love. Ma Goo-Rim (Baek Sung-Hyun) was once a popular singer, but because of a drug scandal is mired in despair. Choi Seo-Won (Choi Tae-Hwan) is a medical student at prestigious Seoul National University, but he has leukemia. Sung Dae-Sung (Byun Joon-Suk) is a sex addict who dreams of becoming a successful movie director.—http://asianwiki.com/Speed_(Korean_Movie)

Four high school friends maintain their ties but finds themselves in very different situations when they reach 21. Chu-won was a promising athlete but, drinking heavily and unable to get past an old flame, he ruins his prospects. Goo-rim became on idol singer, but a drug scandal has seen him fall on hard times. Seo-won, as a medical student at a top university, was faring best among them, until he is diagnosed with leukemia and falls for a teenage escort from their old high school. Meanwhile, Dae-sung is a sex addict with a penchant for mature women who dreams of making his own film.