Song "RooKie" Eui-jin joined the KT Rolster Arrows as a mid laner, originally with the name Most 3. This new KTA team played their inaugural OGN in HOT6iX Champions Spring 2014. They managed to upset SK Telecom T1 K in the group stage and made it to the quarterfinals but they lost 3-1 to CJ Entus Blaze. HOT6iX Champions Summer 2014 was KTA's breakthrough season, upsetting Samsung Blue 3-2 in the finals to win the OGN Championship. KTA managed to qualify for the 2014 Season Korea Regional Finals but they lost 3-0 to NaJin White Shield in the second round. Rookie left the Arrows in October to join Invictus Gaming in December alongside his teammate from KTA, KaKAO.
RooKie played in his first full tournament with the team during the 2015 Demacia Cup Spring Season where they managed to make the finals but lost 3-0 to EDward Gaming. IG placed fifth in the 2015 LPL Spring Regular Season but placed third in the 2015 LPL Spring Playoffs after losing 3-0 to EDG in the semifinals but beating Snake eSports 3-1 in the third place match. In the 2015 Demacia Cup Summer Season, IG placed fourth by making it to the semifinals but losing 3-1 to EDG and then 3-2 to Snake. IG placed third in the 2015 LPL Summer Regular Season and managed to play third in the 2015 LPL Summer Playoffs by losing 3-2 to the Qiao Gu Reapers but beating EDG 3-1. IG qualified for the 2015 Season China Regional Finals and placed second by beating Qiao Gu 3-0 to take the third and final Chinese seed for the 2015 Season World Championship. IG was placed in a group alongside Cloud9, Fnatic, and AHQ e-Sports Club. Unfortunately, they ended with a 2-4 record and were knocked out of the tournament in last place.