Career
He has formerly played for F.C. Gifu in the J. League Division 2. Seo made his professional debut with Seongnam Ilwha, having joined the club in 2002 from Dankook University. Although he stayed with Seongnam for three seasons, he never featured as a regular at senior level, making only three K-League appearances in this period.
He transferred to Daegu Football Club in 2006, but played only one competitive match for the club, in the League Cup.
Foreign 2007, he moved to Suwon City Football Club, who play in the second tier, semi-professional of Korea National League. Following two seasons at Suwon, Seo moved to Japanese J2 League club Football Club Gifu.