Initially skating recreationally, he later became inspired to pursue competitive figure skater after witnessing Cha Jun-hwan's achievements.

[7] He would subsequently compete on the senior level at the annual South Korean Ranking Competition, where he won the bronze medal.

[12] He went on to compete on the senior level at the annual South Korean Ranking Competition, winning the silver medal.

[14] Competing at the World Junior Championships in Taipei, Seo won the short program with a clean skate.

[8] At the 2024 JGP Czech Republic, Seo placed third in the short program and second in the free skate but managed to accumulate enough points to win the gold medal.

[17][18] In late November, Seo competed on the senior level at the annual South Korean Ranking Competition, where he won silver for a second consecutive time.

[8] At the Junior Grand Prix Final in Grenoble, France, Seo placed fifth in the short program after falling on a triple flip attempt.

He would, however, go to deliver a clean free skate, winning that segment of the competition and moving up to the silver medal position overall.