His martial arts journey began when he joined his elementary school’s taekwondo team, where he showed natural talent and advanced beyond provincial competitions to participate in the national youth tournament.
He quit taekwondo when he graduated from elementary school, citing a lack of direction and getting into fights with other students.
After being informed of the news, his mother cried in front of the school's principal, and Kwon was motivated to better himself.
[3] Kwon started his professional MMA career in 2014, fighting primarily in South Korea and Japan.
[4] Kwon made his promotional debut against Anthony Engelen on January 19, 2019, at ONE: Eternal Glory.
[8] Kwon faced former ONE Featherweight World Championship challenger Eric Kelly April 12, 2019, at ONE: Roots of Honor.
[14] Kwon faced Bruno Pucci on October 30, 2020, and aired on November 20, 2022, at ONE: Inside the Matrix 4.
[28] Kwon faced Fabrício Andrade in a rematch for the ONE Bantamweight World Championship on January 24, 2025, at ONE 170.