1. All of the plaintiffs' claims are dismissed.

2. The costs of lawsuit are assessed against the plaintiffs.

1. Basic facts

A. 1) The Defendant is a telecommunications business operator under the Telecommunications Business Act and the former Act on Promotion of Information and Communications Network Utilization and Information Protection, Etc. (amended by Act No. 12681, May 28, 2014; hereinafter “former Information and Communications Network Act”).

(2) The Plaintiffs are those who have used or used the information and communications services provided by the Defendant upon entering into a contract for the use of information and communications services with the Defendant. The Ethical website (my.olh.com) established by the Defendant is a website on which a general subscriber (customer) may inquire into the specifications of charges.

B. From August 8, 2013 to February 25, 2014, the Defendant’s customer information leakage 11,708,875 (hereinafter “the instant personal information leakage”) revealed a total of 11,708,875 personal information of users, including the Plaintiffs, by illegally inquiring into another person’s fee specifications via the Marina website (hereinafter “the instant personal information disclosure”).

2) It is presumed that the route users’ personal information is leaked in the following ways and methods:

A) The piracy installed and executed a “frequency Program” on its own PC, and then connected to the Maol website to put up its certification information (ID and password) and enter one’s own certification information (ID and password). (b) The web server on the Maol website shall transmit user-certified information to the integrated certification server, and the integrated certification server shall identify whether the hacker is a member of the web site and its password is consistent.

In the same case, the web server shall deliver to the user PC the information that the hacker became the hacker's membership.

At this time, the service contract number number of an piracy is a serial number of nine-dimensionals assigned to each service to which each subscriber has joined.

A number of the services provided by the defendant.