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Yonsei University confirmed that its portal service was hacked, leaking personal information of about 15,000 students, graduates, and staff, including student IDs, names, phone numbers, emails, and IP addresses. The unauthorized access occurred twice, on Oct. 20 at 7:41–7:43 p.m. and Oct. 21 at 10:04–10:11 a.m., and the university has requested a police investigation. Korean media reports vary slightly on the number, with Yonhap and the Korea Times citing about 10,000, while Dong-A Ilbo and Chosun Ilbo report 15,000. The university said it is notifying affected individuals and strengthening security measures.