Riot games have offices in which city that has 678,102 international residents ?
Riot Games:  They currently have additional offices located in Berlin, Dublin, Hong Kong, Istanbul, Mexico City, Moscow, New York City, St. Louis, Santiago, São Paulo, Seoul, Shanghai, Singapore, Sydney, Taipei, and Tokyo. Seoul:  The Seoul Capital Area houses about half of the country's population of 51.44 million people with 678,102 international residents.
Seoul