SK Group Chair apologizes for data breach affecting 23 million users, pledges free USIM card replacements.

SK Group Chairman Chey Tae-won apologized for a major data breach at SK Telecom, affecting 23 million users. The breach, caused by malware, led to users replacing their USIM cards. Chey promised a thorough security review with outside experts and urged customers to sign up for SK Telecom’s USIM protection service. The company is replacing USIM cards free of charge and has temporarily suspended new sign-ups to focus on customer protection.