Formerly a StarCraft and StarCraft2 player, he is one of 3 Terrans to be under the wing of[clarification needed] Choi "iloveoov" Yeon-sung.

Jung is known as a Terran innovator in professional StarCraft, taking one gold and three silver medals in the OnGameNet Starleague.

Jung is also known for his 3–0 performance in the biggest competition in professional Korean StarCraft, the 2008–2009 Shinhan Bank Proleague Finals,[1] in which he defeated his Zerg rival Lee Jae-dong twice to carry his team, SK Telecom T1, to the championship.

Since then his performances in Proleague and individual leagues have proved him one of the best Terran players in the game.

[2] He joined SANDBOX Gaming as a League of Legends coach in November 2019.