Lee "Rush" Yoon-jae (Hangul: 이윤재) is the jungler for KT Rolster.
On November 26th, 2014, LMQ announced Rush as their new jungler. A month later, LMQ rebranded to Team Impulse. seed from LMQ. After using Rhux as a substitute for Impact in the first week, Team Impulse finished the 2015 NA LCS Spring Season with an 11-7 record, in fourth place. In the 2015 NA LCS Spring Playoffs, they lost 3-1 to Team SoloMid and then 3-2 to Team Liquid, placing fourth overall.
In the 2015 NA LCS Summer Season, TIP had to replace XiaoWeiXiao with their new support Gate due to allegations of elo boosting. This temporary suspension was eventually lengthened to a competitive ban until February 2016. Regardless, Team Impulse finished the last week tied for third place with Gravity and then won their tiebreaker game. In the 2015 NA LCS Summer Playoffs, the team beat Dignitas 3-0 before losing to both Counter Logic Gaming and Team Liquid to finish fourth, leaving them with the second-place spot in the 2015 Season North America Regional Finals. At the regional finals, they became the second team in a row to fall to underdogs Cloud9 in a reverse sweep and fell short of the 2015 Season World Championship.
Rush left Impulse to join Cloud9 as their new jungler in November 2015. C9 competed at IEM Season X - Cologne but they lost 2-1 in the first round to H2k Gaming. In the LCS, they finished in third place in the regular season before being eliminated in the quarterfinals by TSM.