On December 13, 2012, SK Telecom expanded into
League of Legends esports by acquiring the roster of Eat Sleep Game, and created the team SK Telecom T1 S. On February 26, 2013, they created their second
League of Legends team, SK Telecom T1 K. In 2014, SK Telecom T1 K followed their success through in the OGN winter season, winning the tournament without dropping a single game. They would then go on to win All-Star Paris 2014. However, their Winter season success did not follow through and after the Spring and Summer seasons, SKT T1 K failed to qualify for the
2014 World Championship. In the following offseason,
Riot Games changed the team regulations so that each organization may only have one team participating in each league. This led to the merger of SKT T1 K and SKT T1 S, and the subsequent departures of
Impact and
Piglet for the
NA LCS. The new team would compete under the name SKT T1. . At the
2015 World Championship, SKT won the title while losing only one game in the finals for a record of 15–1 over the course of the tournament. SKT team started off the 2016 Season by winning the LCK Spring Split. With this victory, SKT was guaranteed a spot in the
2016 Mid-Season Invitational. At that point in time, MSI was the only major international tournament they had yet to win. They were heavily favored coming into the tournament, but were initially unable to perform up to their usual standards, unexpectedly losing several games in the group stage. However, they managed to turn things around during the elimination round and eventually clinched the title by sweeping the North American team,
Counter Logic Gaming, in the finals. SKT placed third in the
2016 LCK Summer Split, but still qualified for the
2016 World Championship through circuit points. The team swept through the group stage and advanced towards the playoff round. In the semifinals they defeated the
ROX Tigers in a close 3–2 series. In the finals they defeated
Samsung Galaxy in another close 3–2 series, winning their third world championship title.
Faker was voted as the Most Valuable Player of the tournament. SKT won the 2017 LCK Spring Split, clean sweeping
KT Rolster 3–0 in the finals. This win qualified them for the
2017 Mid-Season Invitational. At the 2017 Mid-Season Invitational, SKT topped the group stage with a 8–2 record. SKT then swept
Flash Wolves 3–0 in the semifinals and defeated
G2 Esports 3–1 in the finals, becoming the first team to win the Mid-Season Invitational back-to-back. At the
2017 World Championship, SKT were considered to be strong favourites to lift the cup for a third consecutive time despite not winning the LCK Summer Split. After a 5–1 group stage, SKT narrowly defeated
Misfits and
Royal Never Give Up in the quarterfinals and semifinals, respectively, before facing Samsung Galaxy in a repeat of the previous year's final. Despite being favourites going into the game, Samsung Galaxy swept SKT 3–0, ending their domination at the World Championship. SKT lost to Gen.G in the 2018 Korea Regional Finals, failing to qualify for the
2018 World Championship. In April 2019, SKT won the
LCK Spring Split. As champions, SKT represented the LCK at the
2019 Mid-Season Invitational. They finished the group stage in second place but lost 3–2 to G2 Esports in the semifinals. In the
LCK Summer Split, SKT repeated the success and defended their title. SKT qualified as the LCK's first seed for the
2019 League of Legends World Championship, where they were once again defeated by G2 Esports in a semifinals series, losing 3–1. In October 2019, SKT rebranded as T1 after partnering with
Comcast Spectacor. In February 2020, Faker had re-signed with the team for three years, in which his contract would last until 2022. He also became a part owner of T1 Entertainment and Sports. In April of the same year, T1 defeated
Gen.G and won their ninth LCK title. At the
2021 League of Legends World Championship, T1 was eliminated in the semifinals by
DWG KIA, losing 3–2 in a best-of-five series. . During the
2022 LCK Spring, T1 went undefeated in the regular season with an 18–0 record, becoming the first team to achieve this record since the league's inception. In the playoffs, T1 won its tenth LCK title, defeating Gen.G 3–1 in the finals. On the international stage, T1 finished as the runners-up of the
2022 Mid-Season Invitational, losing in the final to Royal Never Give Up. The team also finished as the runners-up at the
2022 League of Legends World Championship after losing 3–2 to
DRX in the final. The team had qualified for the tournament as the second seed from the LCK by the virtue of having the most Championship Points. In the
2023 LCK Spring Split, T1 qualified for the playoffs as the first seed, posting a 17–1 record as all five members of the roster were chosen for the All-LCK First Team, a first in LCK history. The team won every series to advance to the finals, qualifying for the
2023 Mid-Season Invitational after defeating Gen.G in the upper bracket semifinals. T1 lost the Spring Split title against the same opponent in a rematch of the 2022 LCK Summer 2022 finals, as Gen.G won the match 3–1. T1 was then defeated 3–2 by
JD Gaming and 3–1 by
Bilibili Gaming to exit the Mid-Season Invitational at the loser-bracket final. At the
2023 League of Legends World Championship, T1 won its fourth World Championship title, the first in seven years, after defeating
Weibo Gaming 3–0 in the finals held at the
Gocheok Sky Dome in Seoul. T1's top laner
Choi "Zeus" Woo-je was named finals MVP. At the
2024 League of Legends World Championship, T1 won its fifth World Championship title after defeating Bilibili Gaming 3–2 in the
final, held in London. Faker was named the finals MVP, marking his second time receiving the honour. T1 repeated the feat in the
2025 edition for their record-extending sixth and third consecutive title after defeating their rivals KT Rolster 3–2 in the 'Telecom Derby'.
Seasons overview ;As SK Telecom T1 S ;As SK Telecom T1 K ;As SK Telecom T1 / T1
Roster ==
StarCraft ==