 On 4 March 2020 Lee signed for K League 1 side, Ulsan Hyundai.He made his debut on 9 May 2020 in a 4–0 win against Sangju Sangmu and scored his first two goals on 6 June 2020 in a 4–0 win against Pohang Steelers.Lee's international career started as part of the South Korea under-20 squad in the 2007 FIFA U-20 World Cup.