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Recently, the investment of 800 billion won, which was concentrated in overseas interest rate derivatives, was in danger of losing the principal. Most of them are private investors and the FSS said they will investigate from the product design stage.

Reporter Jang Hoon-kyung reports.

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Kim, who is 64, invested 500 million won in his UK interest rate derivatives, DLF, in May, including his wife's retirement allowance.

As it was retirement funds, I asked them to manage it safely, but the bank reassured me that it was unlikely to lose.

But now, three months later, they have lost about 200 million won, or 40% of their principal, rather than profit.

[Mr. Kim / DLF Investor: Please rest assured that you have never lost. If there had been any talk of such a high-risk principle, we didn't go in at all. I trusted the bank.]

Of these overseas interest-linked derivatives sold by Woori and Hana Bank, about 730 billion won has already been lost.

There is a possibility that banks have not properly informed that they may lose money when selling goods.

They may be obsessed with their performance rather than stable operation.

[Uri Bank Representative (Last June): (Overseas Linked) Interest rate products were recommended. Don't worry, stay at ease.]

Some banks reviewed the product and decided not to sell it, but we could not filter out one with us.

Investors are expected to lose hundreds of billions of won, but securities companies, managers, and banks that have made and sold their products have earned commissions of about 10 billion won.

Banks say they are not unfairly sold as long as investors have signed them, but the FSS says it will enter a dispute resolution process if it finds that it has not properly communicated the risks of an investment.