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South Korea's financial regulator, the Financial Supervisory Service (FSS), said it is closely monitoring the Japan-linked investment group The NEXROC's surprise announcement of a potential tender offer for JYP Entertainment, calling the move "very unusual" and vowing to launch a swift investigation if any unfair trading is suspected. Yonhap reports the FSS noted it is "extremely exceptional" for a party to express intent to launch a tender offer before even filing the required tender offer statement. The Maeil Business Newspaper adds that JYP said it has not received any acquisition proposal, while the stock surged over 17% in after-hours trading following the announcement. The FSS is also watching for any illegal transactions and will act if violations are found.