Seok-Yeol Yun in Saemangeum ‘Secondary Battery Specialized Complex’ 10 Trillion Economy Chaebol Real Estate At the 'Saemangeum Secondary Battery Investment Agreement Ceremony' held at the Gunsan Saemangeum Convention Center (GSCO) on the 2nd, President Yoon Seok-yeol identified Saemangeum as 'Korea's best secondary battery center' and tried to attract domestic conglomerates and foreign companies..