The twist? Bong-goo suffers from , a rare condition that causes him to age rapidly; although he is a child mentally, he appears to be a man in his mid-30s. Sang-woo initially tries to use his brother's intimidating appearance to help collect debts, but their journey eventually forces them to confront their shared past and build a genuine connection. Cast and Crew

Oh! Brothers was a sleeper hit in Korea. It balanced crude humor (Sang-woo’s get-rich-quick schemes) with devastating pathos (Bong-gu’s list of things he wants to do before he dies due to his aging disease). The film was notable for using makeup and CGI to create the "aged" child, avoiding the need for a permanently altered child actor. It was released on DVD in late 2003 and early 2004 across Asia, but never got a wide international physical release.

The film follows Oh Sang-woo (played by Lee Jung-jin), a cynical, debt-ridden con artist who suddenly inherits a mountain of debt and a peculiar younger brother, Oh Bong-gu (played by the legendary comedian Jung Woo-sung — no, not the other Jung Woo-sung, but a child actor with a rare genetic condition called progeria , which causes rapid aging). Bong-gu looks like a 70-year-old man despite being only 13.

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