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, U (hacker) leaked 11,708,875 personal information of users including the Plaintiffs, including the Plaintiffs, in a manner of illegally approaching the Plaintiff’s customer information and inquiring about the details of other persons’ charges (hereinafter “Leakage of the instant personal information”).

2) It is presumed that piracy has leaked personal information in the following ways and route:

A) After installing and implementing a piracy program on its own PC, the Roer entered his/her own certified information (ID and password) by accessing the Roster website by pointing out the Round’s Round, putting out his/her own certified 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 coincide.

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 services provided by the defendant.