

Daeryun sues and accuses SKT... “Best for relieving actual damage”
2025-05-02

Approximately 900 people applied to participate in the class action lawsuit
“We will hold legal responsibility until the end and lead to a just resolution.”
In relation to SK Telecom's large-scale SIM information leak, Daeryun Law Firm, a large domestic law firm, filed a complaint and complaint against SK Telecom. Previously, Daeryun announced its official response policy through a statement on the 30th, saying that this incident was more than a simple information leak and was a serious issue that broke the public's trust in information protection.
At around 2 p.m. on the 1st, lawyers Son Gye-jun, Shin Jong-soo, and Ji Min-hee from Daeryun Corporate Law Group filed a complaint against SK Telecom's CEO Yoo Young-sang and the security manager on charges of Article 356 (breach of trust in office) and Article 137 (obstruction of hierarchical official duties) of the Criminal Act at the Namdaemun Police Station in Seoul.
Attorney Son Gye-jun said, “The members of our corporation are also victims who experienced the same situation,” and “We deeply sympathize with the victims’ confusion and anger, and decided that this was a moment when a responsible response was needed.”
Regarding the charge of breach of trust, he said, “The defendants (SK Telecom) and others are experts in the mobile communications industry, and although they recognized the need for office work to store and utilize users’ SIM-related information, they neglected management.” He added, “Despite being the only one among the three mobile communications companies to increase operating profit last year, they pursued maximum corporate profits by reducing investment costs for information protection.”
He explained that what is particularly problematic is the circumstances of the manipulation at the time of reporting. SK Telecom first recognized abnormal signs in its in-house system around 6:00 PM on April 18, and although it discovered malicious code around 11:00 PM on the same day, it delayed the recognition of hacking to 3:30 PM on April 20 and reported it to the Korea Internet & Security Agency (KISA).
Regarding this, “SK Telecom’s false reporting of the time of recognition constitutes obstruction of official duties by hierarchy and is a serious violation of the law that impedes the appropriate initial response of government agencies,” he said. “KISA has a public obligation to immediately take necessary measures in the event of a hacking incident in accordance with the Information and Communications Network Act, and SK Telecom’s hierarchical false reporting is a clear act of obstruction of this.”
Meanwhile, SK Telecom has not yet provided a specific explanation on the extent of damage from the leak or follow-up response. In response to this, Daeryun said, “The asymmetry of information is increasing the damage,” and added, “We urge investigative agencies to conduct a thorough investigation and establish responsibility, and hope that the substantive truth is transparently disclosed.”
Lastly, Daeryun emphasized, “The accusers and accusers are suffering great damage due to the leak of SIM card information due to breach of trust, etc., while the accusers and accusers are not clearly disclosing the scale of the leaked victims and the follow-up procedures.” He added, “I hope that this civil and criminal response will provide real relief to the victims, and I will do my best to hold them legally responsible until the end and bring about a just solution.”
Currently, the number of applicants to participate in the class action lawsuit through the Daeryun website exceeds 900 as of 2 p.m. on May 1, and they also plan to file a claim for collective damages.
Reporter Park Jun-sik (parkjs@wowtv.co.kr)
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