The film stars Lee Jong-jae as Sang-wu, a jaded paparazzi photographer who deals with the less-than-moral side of life. Squeezed for money by a crooked detective, Sang-wu is forced to become a debt collector, a profession he finds little success in.

His problems become exacerbated when his estranged father dies and leaves him with a surprise: Bong-gu (Lee Bum-su), his 12-year-old half-brother who looks to be in his mid-30s due to a rapid aging disorder.

Though the idea of a child in an adult's body is nothing new, the 30-year-old Lee Bum-su does a credible job bringing the character to life. Rather than portray the overgrown child as sweet innocence, Bong-gu is a wild and bratty ball of uncontrolled hyperactive energy, making his new big brother's life a living hell.

Lee Jung-jae, who plays the older brother, may be the more popular actor of the two, but his role in this comedy duo is that of the straight man, which he does with anxiety-ridden glee.

The fun really picks up after Song-wu decides to use his younger brother's brattiness to his advantage by making him his partner in crime. Dressed up as a psychotic gangster with a drug addiction _ a performance helped by the diabetic Bong-gu's need for regular insulin shots _ the overgrown child is let loose on the hapless debtors, a ploy that leads to some extremely funny scenes.

As with most domestic comedies, "Oh! Brothers" shifts from comic to sentimental as the story develops. The growing bond between the brothers may be predictably sweet, but the film and the cast manage to pull it off nonetheless.

Director Kim Yong-hwa, who also wrote the film's script, especially shows an even hand that is impressive for a feature-film debut. The timing and pacing of "Oh! Brothers" is such that very little feels out of place, and moviegoers looking to put some fun into their family reunions this Chusok should find it an enjoyable ride.