A. The status of the parties, etc. 1) Defendant KBN Card Co., Ltd. (hereinafter “Defendant National Card”).

Defendant A (hereinafter “Defendant A”) is a corporation that runs the business of issuing, selling, and managing credit cards, pre-paid cards, or debit cards.

(2) The Act on the Use and Protection of Credit Information (hereinafter “Credit Information Protection Act”) shall apply to a company incorporated jointly by a financial institution.

(2) The Plaintiffs are those who have used or used a credit card, etc. upon entering into a contract for the use and financial transaction of the Defendant’s national card, credit card, etc.

B. The concept of the card accident analysis system and the introduction card accident analysis system (hereinafter “FDS”) are introduced by all domestic credit card companies as a system to detect abnormal or fraudulent use due to theft, loss, forgery, etc. of credit cards. According to FDS, an analysis model is made based on statistical methods by utilizing large-scale card use information and pertinent customer information based on past accident transactions and based on the results, if it is discovered that abnormal types of transactions have occurred according to the statistical analysis pattern of the credit card when using the credit card, the approval of the card will be refused.

C. The Defendant’s National Card’s purchase contract with Defendant A on January 30, 2013, setting the contract amount of KRW 227,419,500, and KRW 7 months from the delivery deadline, was concluded on January 30, 2013.

B. The development human resources of Defendant A, including the project general manager B, from February 2013 to August 2013.