Koo "Expession" Bon-taek originally played on Team Hunters as their top laner during Azubu The Champions Spring 2012. The team lost both of the games they played and were knocked out in last place. Expession left the team in May of 2012 to join NaJin Shield as their new top laner. His first tournament with the team was Azubu The Champions Summer 2012 where they placed 3rd in their group and failed to make to to playoffs.
The first OGN of the season for Shield was OLYMPUS Champions Winter 2012-2013 and they placed fifth in their group, missing playoffs once again. Shield participated in the GIGABYTE StarsWar League Season 2 but couldn't make it through the group stage to the bracket stage. They came back to Korea for OLYMPUS Champions Spring 2013, this time making it to playoffs but losing 3-0 to SK Telecom T1 2. Expession left the team in June of 2013 to join the newly named NaJin Black Sword. Expession's first tournament with the team was HOT6iX Champions Summer 2013 where they only placed 3rd in their group and could not make it to the bracket stage. Regardless, the team had garnered enough circuit points to qualify directly to the Season 3 World Championship as the top seed from Korea due to circuit points. They played Gambit Gaming in the quarterfinals and beat them but they lost in the semifinals 3-2 to the eventual champions SK Telecom T1.
The new season began for Sword at PANDORA.TV Champions Winter 2013-2014, where they placed last in their group and did not make it to the bracket stage. Expession left shortly afterwards due to health reasons.
Expession joined Incredible Miracle in June of 2015 as one of their top laners alongside Apple and Lilac. IM placed ninth in the regular season of SBENU Champions Summer 2015 and were forced to play in the LCK 2016 Season Spring Promotion. Incredible Miracle played the Dark Wolves in the promotion tournament and managed to beat them 3-1 to requalify for the LCK.
IM competed in the 2015 LoL KeSPA Cup where they lost 2-1 against the Jin Air Green Wings in the first round. Incredible Miracle rebranded to Longzhu on January 3rd, 2016.
During the 2016 LCK Spring Season, Longzhu played with a 10-man roster, liberally using substitute players. Expession shared play time with fellow top laner Flame. Longzhu finished the spring split in seventh place with an 8-10 set record, missing out on a spot in the playoffs. Longzhu fared poorly in the 2016 LCK Summer Season, going 7-11 in sets and netting them eighth place, letting them escape relegations.