“Credit card details from almost half of all South Koreans have been stolen and sold to marketing firms. The data was stolen by a computer contractor working for a company called the Korea Credit Bureau that produces credit scores. The names, social security numbers and credit card details of 20 million South Koreans were copied by the IT worker. The scale of the theft became apparent after the contractor at the centre of the breach was arrested.”
Source: BBC News – Credit card details on 20 million South Koreans stolen