Lee "KaKAO" Byung-kwon joined the newly formed KT Rolster B roster alongside Ragan, Ryu, Mafa, and Score. KaKAO and KTB played their first tournament as a team during OLYMPUS Champions Winter 2012-2013. The team actually found quite a bit of success, placing third after losing two best of 5s, 3-1 and 3-0, to NaJin Sword but beating Azubu Blaze 3-0. KaKAO was moved to KTB's sister team, KT Rolster A. KTA played in OLYMPUS Champions Spring 2013 but they failed to make it past the group stage. KaKAO left the team to join the newly named KT Rolster Bullets. The Bullets made it all the way to the finals of HOT6iX Champions Summer 2013 and played what's considered to be the best series of all time against SK Telecom T1. Unfortunately, the Bullets lost 3-2 and placed second. KTB attended the Season 3 Korea Regional Finals and met SKT in the finals. Once again they lost, this time 3-1.
The new season began for KaKAO and his team at PANDORA.TV Champions Winter 2013-2014. The Bullets placed third after losing to SKT K 3-0 in the semifinals but beating NaJin White Shield 3-1 in the third place match. KaKAO was moved to the KT Rolster Arrows shortly afterwards as their new jungler. This new KTA team played their inaugural OGN in HOT6iX Champions Spring 2014. They managed to upset SKT 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. KaKAO left the Arrows in October to join Invictus Gaming in December alongside his teammate from KTA, RooKie.
KaKAO 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.
KaKAO left IG in December of 2015.