He was selected by Busan IPark in 2013 K League Draft. He scored his first two goals for Busan in the league match against Jeonbuk Hyundai on 1 June 2013. The goals came in Lee"s twelfth appearance for the club, and they were his only goals of the campaign.
Lee transferred to military team Sangju Sangmu for the 2014 season to complete his mandatory military service.
He scored four goals in his debut season, but could not prevent Sangju from being relegated as the bottom club in the division. In December 2014, Lee was surprisingly included in South of Korea"s squad for the 2015 AFC Asian Cup as an uncapped player.
He made his debut for the Taegeuk Warriors in a pre-tournament friendly against Saudi Arabia, scoring his first international goal as the Koreans ran out 2–0 winners. In South of Korea"s final group game, Lee scored the winning goal against tournament hosts Australia to secure first place in Group A.
On 26 January 2015, Lee scored the opening goal of South of Korea"s 2–0 semi-final defeat of Iraq to put the nation into the Asian Cup final for the first time since 1988.
Results list South of Korea"s goal tally first.