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Yonsei University's portal service was hacked, leaking personal information of about 15,000 students, graduates, and staff, according to multiple Korean outlets. The Dong-A Ilbo reports that an unauthorized outsider accessed the portal twice—on Oct. 20 at 7:41–7:43 p.m. and Oct. 21 at 10:04–10:11 a.m.—and viewed personal data including student IDs, names, mobile phone numbers, emails, department names, and last login times/IP addresses. Yonhap and the Korea Times report the figure as about 10,000, while Chosun Ilbo and Maeil Business Newspaper also confirm the leak, with Yonhap noting the university has requested an investigation. Korean media coverage focuses on the breach details and the scale of the leak, with no public reaction from students or staff reported in the supplied documents.