Thousands of angry customers are swarming into their banks for a second straight day on this Tuesday to get their credit card details changed and to file complaints about the banks' mismanagement of their personal information.
Concerns are rising that customers' information may have fallen into the hands of scammers with reports emerging that suspicious and unintended financial transactions have been made on accounts.
The leak is one of the worst in the country's history with the personal data, bank account details, addresses and credit ratings of millions of people now out in the open.
The three card firms -- KB Kookmin Card, NH NongHyup Card, and Lotte Card -- said they would fully cover any financial losses suffered by their customers from scams linked to the data leak.
The Financial Supervisory Service and the Financial Services Commission plan to form a joint task force with the three firms to prevent further damage to victims and also toughen regulations for data breaches to counter possible crimes using the stolen data.
Financial regulators will also punish the banks involved for their management failures.
The firms have vowed to issue new cards to affected users and compensate for all financial and mental damages card users may have suffered.
This information leak comes less than one month after the personal data of some 130-thousand Standard Chartered Bank Korea and Citibank Korea customers was stolen.
Ji Myung-kil, Arirang News.
Meanwhile, the government says that on Wednesday it will announce countermeasures to stop similar data leaks from recurring as well as toughened penalties for those involved in leaking data.