Lim had played professionally since version 1.07 of StarCraft, and managed to stay competitive by constantly changing his style, and has had a great influence of the development of modern playing styles, especially for Terran players. He is the all-time leader in games played and wins. He is a two time OSL champion, one time MSL champion, two time World Cyber Games (WCG) champion, and leader of the SK Telecom "T1" team. He is considered to have a strong eye for talent in that position, as he drew Choi Yeon-Sung (iloveoov), among others, from the amateur ranks. His team has consistently been the strongest in the Proleague. In August 2006 Lim announced at the MSL group draws that he had received his draft letter from the government, and would be entering the Republic of Korea Air Force (ROKAF) by the end of the year. He later said he would try his best to return after his 2 and a half years of service. After Lim joined the Republic of Korea Air Force, he started putting his fame to work. After a month and a half an Air Force pro-gaming team was created. Lim found some retired pro-gamers who joined the Air Force before him, including H.O.T-Forever, CLon, ChRh, fOru, Rage, Qoo, Sunny and MuMyung. Together they formed the first military pro-gaming team. Two months after the team was announced, ACE (Airforce Challenge E-sports) was official. ACE first played in the 2008 ShinHan Proleague, and has participated ever since. On December 22, 2008, Boxer returned to SKT1 and played on that team as military service was ending, and has remained on its A-Team; however, he has concentrated on playing individual league matches since then. In September 2010, Boxer began playing high level "StarCraft II" games against other pro gamers as Terran under the username ManofOneway, but has switched to SlayerSBoxeR since he announced his return. He is now playing "StarCraft II" at a professional level and has made it to the Round of 4 in GSL (GOMTV Global StarCraft II League) Open Season 2, where he lost 0–4 to NesTea. However, he would not fare as well in following seasons, even dropping to Code A (the lower GSL League) in March 2011. He formed the "StarCraft II" clan SlayerS (sls) in November 2010.