Rookie (also stylized RooKie and RooKiE) joined KT Rolster Arrows as a mid laner, originally with the name Most 3. This new KTA team played their inaugural OGN in HOT6iX Champions Spring 2014. They managed to upset SK Telecom T1 K in the group stage and made it to the quarterfinals but they lost 3-1 to CJ Entus Blaze. HOT6iX Champions Summer 2014 was KTA's breakthrough season, upsetting Samsung Blue 3-2 in the finals to win the OGN Championship. KTA managed to qualify for the 2014 Season Korea Regional Finals but they lost 3-0 to NaJin White Shield in the second round. Rookie left the Arrows in October to join Invictus Gaming in December alongside his teammate from KTA, KaKAO. Rookie and iG started the season with a strong showing in the LPL, placing 2nd in the LPL Spring Season en route to their first domestic win in the organization's history. Rookie and iG win 3-0 against JD Gaming in the finals, qualifying iG for the 2019 Mid-Season Invitational.