Former Pusan Daewoo Royals and South Korean international defender Jung Kwang-seok was appointed the club's inaugural manager.

Yongin City made a solid start to life in the National League in 2010, then the unofficial second tier of football in Korea, finishing with the sixth-best overall record of all clubs in the division for 2010.

Despite a solid league campaign Yongin exited the 2012 FA Cup at the first hurdle yet again as their Second Round encounter with National Police FC ended in a 4–0 home reverse.

There was to be some success for the squad at the National Sports Festival football tournament in October that year as they finished joint-third with Gimhae FC and were awarded the bronze medal having been eliminated at the semi-final stage 10–9 on penalties by Gangneung City.

Although Yongin finished ninth out of the ten sides they were just five points adrift of fourth place and the final championship playoff spot.