Competitive skating career
2024–25 season: Junior Grand Prix debut
Choi made his ISU Junior Grand Prix debut at 2024 JGP Thailand in Bangkok. After a clean skate, he was third in the short program but placed seventh in the free skate, falling on three jumps, including on a quadruple salchow attempt. He would go on to place sixth overall in the event. His second Junior Grand Prix assignment was to 2024 JGP Slovenia in Ljubljana. Again, he was third after the short program and seventh in the free skate. In the free skate, he landed his first quadruple salchow in international competition and placed fifth overall.
Subsequently, he would place fifth at the 2025 South Korean Figure Skating Championships and was assigned to the 2025 World Junior Championships. He was sixth in the short program and fourth in the free skate, placing fifth overall at his first World Junior Figure Skating Championship. "I made a mistake on the quad toe, but everything else went well, so I’m very happy about that," he said in an interview after his free skate. "I’m very glad I could be in the top six at my first Junior Worlds."
2025–26 season: Junior Grand Prix Final, National bronze medal
Choi competed in 2025 JGP Italy in Varese, where he was first after the short program but fell to second overall behind Taiga Nishino after mistakes in his free skate. Nevertheless, he successfully landed a quadruple lutz in the free, becoming the first South Korean to land one in international competition. At 2025 JGP Poland in Gdańsk, he won his first Junior Grand Prix gold medal, which qualified him for the 2025–26 Junior Grand Prix Final.
At the 2025–26 Junior Grand Prix Final in Nagoya, Choi was fifth after the short program after missing his mandatory jump combination. "I was kind of nervous because there were a lot of audience and spectators in the stadium today," he shared following his short program. Choi was sixth in the free skate and therefore finished sixth overall at the Junior Grand Prix Final. At the 2026 South Korean Figure Skating Championships, he placed third in both the short program and the free skate to win the bronze medal, behind Cha Jun-hwan and Seo Min-kyu.
Selected to compete at the 2026 World Junior Championships in Tallinn, he was ninth in the short and fourth in the free short to finish in fifth place overall.
2026–27 season
Opening his international season at 2026 JGP Latvia in Riga, Choi was fifth after the short program after making a mistake on his combination jump. However, he came back from fifth to first in the free, scoring a personal best and winning his second JGP gold medal. With his free skate, he became the first South Korean to land three quadruple jumps—two quadruple lutzes, one in combination, and one quadruple toe loop—in a program in international competition. Habin later won the bronze medal at the JGP in Turkey.
South Korea