Lee "Easyhoon" Ji-hoon joined the competitive scene in late 2012 when he joined GSG as their new starting mid laner under the name Easy. The team participated in OLYMPUS Champions Winter 2012-2013 where they failed to make it out of groups, placing 9th-16th. The team was bought out by MVP in February of 2013. The roster was changed and the remaining members became the new roster of MVP Blue. The team went to its first event at OLYMPUS Champions Spring 2013 where they couldn't make it out of groups. Next they went to HOT6iX Champions Summer 2013 where they lost in the group stage once again, ending a disappointing season for the team. At the end of the season, the team was picked up by Samsung, forming Samsung Blue. Easyhoon left the team a few days later.
At the conclusion of Season 3, Easyhoon was picked up by the newly reformed SK Telecom T1 1. The team changed their name shortly afterwards to SK Telecom T1 S. S participated in their first OGN as a team at PANDORA.TV Champions Winter 2013-2014. For the 4th time in Easyhoon's career, he failed to make it out of the group stage. S experienced similar results at HOT6iX Champions Spring 2014 when, again, they couldn't make it past groups. The team experienced their breakthrough at HOT6iX Champions Summer 2014 when they made it to the semifinals but placed 4th after losing 3-2 to the KT Rolster Arrows and then losing 3-0 to Samsung White.
With the changes to the OGN rules, S and their sister team SK Telecom T1 K were forced to merge to form SK Telecom T1. Easyhoon was kept by the team and he spent most of SBENU Champions Spring 2015 switching with Faker when necessary. The team made the finals against GE Tigers where Easyhoon started all 3 games and they swept the Tigers 3-0 to become the champions. SK Telecom's victory qualified them for the 2015 Mid-Season Invitational where they made it to finals but lost 3-2 to EDward Gaming with Easyhoon playing in 3 of the games. SKT placed first in the regular season of SBENU Champions Summer 2015 after only dropping one set the whole season. They beat KT Rolster 3-0 in the finals of the playoffs to qualify for the 2015 Season World Championship as the top seed from Korea. Easyhoon did not get to play in the playoffs. SKT was placed in a group at worlds alongside EDG, Bangkok Titans, and H2k Gaming. They went undefeated all the way to the finals, beating AHQ e-Sports Club and Origen in the playoffs along the way. They met the KOO Tigers in the finals and beat them 3-1 to give the organization its second World Championship.
Easyhoon left SK Telecom shortly after the KeSPA Cup, which he did not play in. He moved to China, signing with Vici Gaming in December 2015. On 17 December, Easyhoon made his debut for Vici Gaming in a losing effort to Royal Never Give Up in World Cyber Arena 2015.