2. The Defendants jointly do the remainder other than Plaintiff C.

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

Defendant B Co., Ltd. (hereinafter “Defendant B”) is a company engaged in the business of issuing, selling, and managing credit cards, pre-paid cards, or debit cards.

(2) The Plaintiffs are those who have used or used a credit card, etc. upon entering into a contract for use and financial transaction with Defendant A and a credit card company under the Credit Information Use and Protection Act.

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. Defendant A’s customer information leakage 1) concluded a contract with Defendant B on January 30, 2013, setting the contract amount of KRW 227,419,500 with Defendant B, and within seven months from the date of concluding the delivery period, to provide customer information and customer information.

B. The development human resources of Defendant B, including Defendant D, including the general manager of the project, were put into Defendant A from February 2, 2013 to August 2013 and started the FDS development work. From February 2013 to March 2013, Seoul Jongno-gu.