Choi Yeon-sung (born 5 November 1983), also known as iloveoov, is a retired professional Korean StarCraft player, and currently a coach for the Afreeca Freecs' League of Legends team. As a Terran player he was known for his excellent macromanagement, leading to his nickname "Cheater Terran". However he is better known as "Monster Terran" (Gweh_Mool Terran) because of his ability to produce a massive number of units. He sees Lim Yo-Hwan, who was on the same team as him, as an older brother or mentor. Lim scouted Choi through a match in battlenet after losing to Choi's Terran, Zerg and Protoss. Choi beat Lim 3:2 in 2004 during the Ongamenet Ever Starleague finals.
The 'oov' in his nickname is believed to be the ASCII emotion icon of a face and two fingers forming letter 'V' which stands for victory. He announced his retirement as a pro-gamer as a result of a wrist injury, to become a coach for his team. Since then, Choi returned to the active roster as a "player coach".Ultimately, in 2016 SK Telecom T1 disbanded their Starcraft 2 roster and Choi became head coach for the Alfreeca Freecs League of Legends team. He would lead the team to a quarterfinals berth at the 2018 League of Legends World Championship but was ultimately defeated 3-0 by Cloud9 and eliminated.
He in subsequent seasons he failed to replicate his success in the Summer of 2018, failing to qualify for the World Championship in 2019 and also failing to make playoffs in the 2020 Spring Split.