Lee Bum-young signed a professional contract for Busan I'Park in 2008, later making a total of 17 appearances in his first year for the club. After five years of playing in the K-League, he then became the first-choice goalkeeper for Busan. Lee Bum-young spent three years as a first-choice until the club finished 11th in the league in 2015 and were relegated in the playoffs, losing 0–3 on aggregate to Suwon FC. Lee had made a total of 134 appearances in the league and 163 overall for Busan I'Park.