Kim joined Incheon United in 2014.[4] He made his professional debut against FC Seoul in Korean FA Cup on 30 April 2014 at Seoul World Cup Stadium.[5] In the match, Kim played as a starting line-up. In the 2014 season, when Kim made his debut, he played 14 games in league. In the 2015 season, he played only 3 games (38 minutes) because of his chronic disease. In the 2016 season, he planted himself in the team again. On 24 September 2016, he scored his professional debut goal against Suwon Samsung Bluewings at Incheon Football Stadium.[6] He played 28 games including 22 full-time games and he scored 3 goals. On 5 November 2016, he scored a winning goal against Suwon FC. Incheon United owed confirmation of remaining in the K League Classic to his winning goal.[7]
^브라질 대표 훈련 참여한 김용환, 네이버 스포츠 [Kim Yong-hwan participated in the training of Brazil National Football Team] (in Korean). sports.news.naver.com. 10 October 2013.
^인천 김용환, 포기하지 않는 선수로 기억되고파 [Kim Yong-hwan in Incheon United, he wanted to be remembered as the player who never give up.] (in Korean). sports.news.naver.com. 6 May 2014.
^낭떠러지 위의 인천, ‘파격 변신’ 통했다 [Incheon of crisis,'an extreme makeover' was great.] (in Korean). sports.mk.co.kr. 30 April 2014.
^"[클래식 최종전] '김용환 결승골' 인천, 수원FC 꺾고 극적 잔류 - 인터풋볼" [K League Classic Final Round 'A Winning Goal by Kim Yong-hwan' Incheon dramatically remains by defeating Suwon] (in Korean). Interfootball. 5 November 2016.