SEOUL, , (Pakistan Point News - APP - 12th Nov, 2016 ) - South Korean prosecutors investigating a corruption scandal engulfing President Park Geun-Hye questioned the head of the country's largest steelmaker as well as a top samsung executive on Saturday. Posco chief executive Kwon Oh-Joon was grilled overnight about allegations surrounding the 2014 sale of the company's in-house advertising unit. Kwon was the first head of a major South Korean conglomerate to be questioned over the scandal centred on Park's close personal friend Choi Soon-Sil. The allegations are that one of Choi's associates attempted to force the company that bought Posco's advertising subsidiary to hand over 80 percent of its shares. Kwon, 66, returned home early Saturday after undergoing 12 hours of intensive questioning at the Seoul Central District Prosecutors' Office, Yonhap news agency said.