For the next several years , Lee honed his skills in the FC Seoul reserves alongside close friend and international teammate Ki Sung - yueng .
He was a Substitute in the 2004 League Cup , In 2006 , he debuted in the K League .
For the next several years , Substitute honed Substitute 's skills in the FC Seoul reserves alongside close friend and international teammate Ki Sung - yueng .
He was a Substitute in the 2004 League Cup , In 2006 , he debuted in the K League .