Question: Riot games have offices in which city that has 678,102 international residents ?

Context paragraphs:
David Turley: David Turley (born March 16, 1987), better known by his in-game ID Phreak, is an American "League of Legends" sports commentator for Riot Games.  He has had one of the longest careers of a sports commentator in the North American League of Legends Championship Series and has casted in several major international tournaments.

League of Legends Pro League: Tencent League of Legends Pro League (LPL) () is the top level "League of Legends" league in China. The first season of the LPL was the 2013 Spring season.  The top three finishers of the playoff tournament receive automatic bids to the League of Legends World Championship.  Playoffs are an eight team single elimination with each step a best-of-five series.  The total prize pool is ¥2,350,000.  In 2014 Riot Games began providing an English language broadcast.  The format is modeled after the League of Legends Champions Korea format in South Korea.  In September 2015 it was announced that Riot Games was in negotiations with Tencent to take over operations of the league.

Graham McNeill: Graham McNeill is a British novelist.  He is best known for his Warhammer Fantasy and Warhammer 40,000 novels, and his previous role as games designer for Games Workshop.  He is currently working as a Senior Writer at Riot Games.

Rivington Bruce Bisland III: Rivington Bruce Bisland III (born December 12, 1984), better known by his in-game ID Rivington, is an American "League of Legends" sports commentator and Player Behavior Specialist for Riot Games.  He has had one of the longest careers of a sports commentator in the North American League of Legends Championship Series and has casted in several major international tournaments.

Mid-Season Invitational: The Mid-Season Invitational (MSI) is an annual "League of Legends" tournament hosted by publisher Riot Games since 2015.  It is the second most important international "League of Legends" tournament aside from the World Championship.  The event features the Spring Split champions of the five major competitive "League of Legends" regional leagues, as well as a wildcard team from a lesser region determined by the International Wildcard Invitational, held a few weeks beforehand.  In its inaugural tournament, Chinese team EDward Gaming emerged victorious by defeating Korean team SK Telecom T1 3–2 in the final.

Steve Feak: Steve Feak (born August 1, 1984), better known by the in-game name Guinsoo, is an American game designer.  He was one of the previous designers of the popular "" custom game mode, "DotA: Allstars".  Feak attracted the attention of the game industry and Riot Games, when his mod was played by 10 million gamers.  He began this project while studying computer science at the University of Wisconsin.  Since then, Feak was employed by Riot Games as a game designer for "League of Legends", a multiplayer online battle arena (MOBA) game directly inspired by his previous work.

Kobe (commentator): Sam Hartman-Kenzler (born June 29, 1986), better known by his in-game ID Kobe, is an American "League of Legends" sports commentator for Riot Games.  He has also spent several years playing for the professional team Counter Logic Gaming.  He has had one of the longest careers of a sports commentator in the North American League of Legends Championship Series and has casted in several major international tournaments.

Riot Games: Riot Games is an American video game developer, publisher, and eSports tournament organizer established in 2006.  Their main office is based in West Los Angeles, California.  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: Seoul ( ; 서울; ] ), officially the Seoul Special Metropolitan City – is the capital and largest metropolis of the Republic of Korea (commonly known as South Korea).  Seoul is the world's 16th largest city, and forms the heart of the Seoul Capital Area, which includes the surrounding Incheon metropolis and Gyeonggi province.  The Seoul Capital Area houses about half of the country's population of 51.44 million people with 678,102 international residents.

Adam Harrington (voice actor): Adam Harrington (born June 18, 1970 in San Francisco, California, United States) is an American voice actor, who has appeared in various video games, often working with developers Telltale Games and Riot Games.  Recently, he was the voice for the main character Bigby Wolf in the episodic story driven action-adventure "The Wolf Among Us" developed by Telltale Games, for which he was nominated for a "Best Performer" BAFTA Award.

Supporting paragraphs: Riot Games Seoul
Answer: Seoul