But the proposed cost of using Seoul’s World Cup Stadium was set at 25 billion won, a price no company was willing to play to start a new club.

With no team or company interested, and the national stadium standing empty, the idea was proposed for two clubs to move to Seoul at a cost of 7.5 billion won each, with the Seoul Metropolitan Government contributing the remaining 10 billion won.

Anyang's LG Cheetahs agreed to pay the combined 15 billion won and in 2004 became the new occupants of the World Cup Stadium, delivering a blow to the movement's plans to for a new team.

They won the first ever K3 League title after a 3–0 aggregate victory over Hwaseong Shinwoo Electronics in the championship final.

In 2015 Seoul United formed a sister relationship with Japanese 3rd tier FC Ryukyu, with the intention to play each other once a year.

Ahead of the 2025 season, the club was suspended from participation in the league for one year, with the termination of its agreement with Nowon District cited as one of a number of reasons.