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Mirae Asset Securities, the country's leading brokerage, said Saturday that hackers breached its systems, leaking personal information of some 39,000 customers and employees, Yonhap and the Korea Times report. The attack hit its mobile-web phone authentication login service and the 'mi-global' groupware system on Nov. 4-5, exposing account numbers of about 3,800 customers and personal data of 35,255 employees, including retirees and outsourced workers, according to the Kyunghyang Shinmun. The breach is part of a wider wave: the Financial Supervisory Commission said over 470,000 personal data records leaked from 37 financial firms in the past month, with funds stolen estimated at 1 billion won ($745,000), the Korea Times reports. Earlier, Daishin Securities saw data of 38,490 customers leaked, the Korea Times reported on Oct. 28.