When you read 국내산 (in Chinese characters: 國內産) on a sign or label, it essentially means “Made in Korea.” In this context, 국내 means domestic, while 산 means produce. In an age when made-in-China kimchi or America-produced beef are regarded with suspicion in Korea, the 국내산 label reassures customers that the food or products of a business are 100% Korean.
The butcher shop pictured below sells 한우, which means Korean-raised cows. Just like other countries I have lived in, Koreans believe that beef from their own country is best.
In the case of this store, it is selling products made in Japan. Thus, the word domestic (국내) is replaced with the word for Japan (일본). 일본산 means ‘made in Japan’.