by Qasim Nauman and Kang Jin-kyu Agence France-Presse SEOUL, South Korea (AFP) — Ten years after “Gangnam Style” became a global phenomenon, South Korean rapper Psy is living his best life –- proud of his “greatest trophy” and free from the pressure of repeating that unprecedented success. Uploaded to YouTube on July 15, 2012, the song’s wacky music video became a runaway megahit, with its trademark horse-riding dance spawning thousands of imitations, spoofs and spinoffs. […]