Last updated: 24 April 2021 Source: Fixtures and Results at FC Seoul Official Website Last updated: 19 June 2021.

Source: soccerway Fixtures and Results at FC Seoul Official Website (in English) Note: Where a player has not declared an international allegiance, nation is determined by place of birth.

※ Out: Transferred to other teams in the middle of the season.

※ Discharged: Transferred from Gimcheon Sangmuu for military service in the middle of the season (registered in 2021 season).

※ Conscripted: Transferred to Gimcheon Sangmu for military service after the end of the season.