Lee "Edge" Ho-seong joined KT Rolster as a substitute mid laner in December of 2014. He didn't play any games for them until SBENU Champions Summer 2015, where he played in a set against SBENU Sonicboom. He is currently a sub for KT's other mid laner, Nagne. KT placed second overall during the regular season of Champions Summer. They made it to the finals of the playoffs but lost 3-0 to SK Telecom T1. KT earned enough circuit points to qualify for the 2015 Season Korea Regional Finals where they beat the Jin Air Green Wings 3-1 in the finals to qualify for the 2015 Season World Championship. Edge did not play in the playoffs or the regionals.
KT played in the 2015 LoL KeSPA Cup where they lost 2-1 in the semifinals to CJ Entus. Edge did not play in this tournament. Edge left KT on December 1st to join NaJin e-mFire as their new mid laner. The team renamed to e-mFire while they searched for a new organization. In February, that organization was found, and they renamed once again to Kongdoo Monster.
During the 2016 LCK Spring Season, Kongdoo Monster went 1-17 in sets, ending in last place. This forced them to play a relegation match against challenger team MVP, who defeated them 3-1 and relegating them to Challengers Korea 2016 Summer.