2021 K League 1
The 2021 K League 1, also known as the Hana 1Q K League 1 for sponsorship reasons, was the 39th season of the top division of professional football in South Korea, and the ninth season of the K League 1. Jeonbuk Hyundai Motors won their ninth title and fifth consecutive title.
After progressing 33 regular rounds, the league was divided into two groups, the top six and the bottom six, and each team played five matches against other teams in its group.
Teams
Team changes
Relegated to K League 2
- Sangju Sangmu (renamed Gimcheon Sangmu)
- Busan IPark
Promoted from K League 2
- Jeju United
- Suwon FC