Sejong SA

Sejong SA FC was founded in December 2024 and began recruiting players to compete in the 2025 K4 League.

Inaugural Season

They made their league debut on 22 February 2025 in an away match against Namyangju Citizen, which they lost 2–1. They played their first home match the following week against Daegu FC B, resulting in a 1-3 loss. They struggled to get off the mark and after the first 5 matches, their only point came from a draw against Seoul Jungnang FC. Sejong had to wait until their tenth match for their first league victory, beating title contenders Geoje Citizen.

The club's first ever home victory came in the first round of the Korea Cup when they defeated K3 League side Ulsan Citizen 3-0. They went on to defeat K League 2 club Jeonnam Dragons FC 3-1 in the second round. They were knocked out of the competition in round 3, losing 0-1 at home to K League 1 side FC Anyang.