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JIEUN SEO is a Business Development Director at Persona.ly, a mobile-first DSP operating worldwide. Prior to this role, she served as a Director at SalesAngel, a global team of sales experts focusing on B2B CRM marketing, lead generation, SDR, and expert consultancy services. JIEUN was also a Sales Manager at Singular, and the Chief Executive Officer of Stillyoung, a YouTube music curation service for the senior generation. She has experience in various roles such as Publisher Development Manager at Opera Mediaworks and AdColony, as well as Marketing Manager at Incross, specializing in performance marketing and Korea local adnetwork.