OSO

Founded in 2000 and based in Jung-gu, South Korea, OSO is an online marketing agency working across public institutions, small and mid-sized clients, and companies seeking overseas expansion. The agency describes itself as an early adopter in the domestic market of search engine optimization and video search engine optimization (VSEO) services, positioning its work around search engines including Naver, Google, Yahoo, Baidu and Yandex across multiple countries. Its client roster, as described on its site, includes large Korean corporations and public-sector bodies such as tourism organizations and electronics manufacturers, alongside smaller businesses pursuing export or overseas branding goals. Services listed include search engine optimization (SEO), video/YouTube optimization (VSEO), CPC keyword and display advertising, responsive website design, online press release distribution (ePR), content and social media marketing, and global marketing support tied to export voucher programs. The agency states it holds a domestic exclusive supply agreement with the marketing analytics tool SEMrush, which it references as part of its data analysis and reporting capability. Work is framed around tracking search algorithm changes and trends, tailoring SEO, CPC and social media tactics to each client's industry and goals, and applying these methods to both domestic platforms like Naver and international ones for clients expanding abroad. Case material on the site references keyword ranking placements, YouTube view growth, and traffic changes tied to specific past campaigns.