Kim “PraY” Jong-in was picked up by NaJin Sword in June of 2012. He played in his first OGN at Azubu The Champions Summer 2012 when he went by the name Troll Kim. They lost 3-1 to Counter Logic Gaming Europe in the semifinals but beat Azubu Blaze 2-0 in the 3rd place match. The team earned enough circuit points to qualify for the Season 2 Korea Regional Finals where they made it through the whole gauntlet and beat Blaze in the finals 3-2 to qualify for the Season 2 World Championship. They made it to the quarterfinals of Worlds but lost 2-0 to the Taipei Assassins. A month later, Sword attended the 2012 MLG Fall Championship where they made it to the finals but lost 2-1 and 2-0 in two sets to Blaze.
The new season started off with OLYMPUS Champions Winter 2012-2013 where Sword smashed Azubu Frost 3-0 in the finals to win the whole tournament. Next, they flew to China to participate in the GIGABYTE StarsWar League Season 2where they placed 3rd after losing to Invictus Gaming in the loser’s finals. They came back to Korea for OLYMPUS Champions Spring 2013 where they made it to the quarterfinals but lost 3-1 to Azubu Frost. After the tournament, Sword and their sister team, NaJin Shield were renamed to Black Sword and White Shield, respectively. The final OGN of the season was HOT6iX Champions Summer 2013 and unfortunately Sword failed to make it past the group stage. Despite their poor showing at the last OGN, Sword still accrued enough circuit points to automatically qualify for the Season 3 World Championship. Sword played exceptionally well and took eventual champions SK Telecom T1 to a game 5 in the semifinals but ultimately lost the series 3-2.
Sword’s first tournament of the season was PANDORA.TV Champions Winter 2013-2014 where a poor showing saw them getting knocked out in the group stage. Their streak of poor OGN performances continued at HOT6iX Champions Spring 2014 and they dropped out of the group stages for a 3rd straight time. PraY left the team on May 16th, 2014.
On November 14th, 2014, PraY joined the newly formed HUYA Tigers together with Smeb, Lee, kurO, and GorillA. The team played in the Champions Spring 2015 Qualifiers along with Incredible Miracle, Prime Clan, and Xenics, where they finished 2-1 and qualified for Champions Spring 2015. The team then renamed to GE Tigers. GE started out unarguably the top team in Korea at SBENU Champions Spring 2015 and earned themselves an invitation to the IEM Season IX World Championship in March. However, after defeating Cloud9 and SK Gaming to win their group, they lost 2-1 to Team WE in the semifinals. This defeat was considered by many casters and analysts to be the biggest upset to date in the entire history of League of Legends competition. They qualified for the finals of the OGN playoffs because of their first place finish in the regular season. Unfortunately, they lost 3-0 to SK Telecom T1 in the finals and placed second. The team renamed to the KOO Tigers prior to the start of SBENU Champions Summer 2015. KOO placed fourth in the regular season and qualified for the playoffs but lost 3-2 in the semifinals to KT Rolster. Because SKT won the finals, KOO still qualified for the 2015 Season World Championship as the second seed due to circuit points. KOO was placed into a group at worlds with Counter Logic Gaming, Flash Wolves, and paiN Gaming. They placed second, ending with a 4-2 record. They beat KT Rolster 3-1 and Fnatic 3-0 to make it to the finals against SKT. However, they finally fell in the finals with a 3-1 loss.
Soon after Worlds, Koo dropped the team as a sponsor and they renamed to the Tigers. The Tigers played in the 2015 LoL KeSPA Cup but they were upset in the first round 2-0 by SBENU Sonicboom. The Tigers renamed to ROX Tigers in January.
During the 2016 LCK Spring Split, the ROX Tigers dominated domestically in similar fashion to 2015. They finished the regular season with a 16-2 match record, losing only to KT Rolster and Samsung Galaxy. Earning first place in the regular season gave them a bye to the finals of the Spring Playoffs, where they faced SK Telecom T1. ROX entered as the favorites this time, but still lost 3-1, earning themselves second place for the spring split.
During the 2016 LCK Summer Split, the Tigers once again placed first in the regular season with an impressive 15-3 scoreline in Bo3s, with two losses to SK Telecom T1 and one loss to Samsung Galaxy. This seeded them in the 2016 LCK Summer Playoffs directly into their third domestic finals, where they eventually met KT Rolster. In an epic series, the ROX Tigers won the set 3-2, claiming 1st place in the Summer Split and giving them Korea’s first seed into the 2016 Season World Championship.