Kim "Nagne" Sang-moon joined NaJin Black Sword as a sub in June 2013. His first professional games took place at the Season 3 World Championship where he played all 8 of Sword's games instead of mid laner SSONG. Nagne's play surprised many and Sword ended up losing 3-2 in a close set to eventual champions SK Telecom T1.
Nagne's inaugural games in OGN were at PANDORA.TV Champions Winter 2013-2014 against Incredible Miracle 2 but he only played two games and Sword were knocked out in the group stage after a mediocre showing. He then played in all six games in the group stages at HOT6iX Champions Spring 2014 but once again Sword was knocked out early. Nagne left the team between seasons and joined the KT Rolster Bullets. He participated in HOT6iX Champions Summer 2014 with his new team but they failed to make the quarterfinals. The KT Bullets gained enough circuit points to go to the 2014 Season Korea Regional Finals but were swept in the first round by NaJin White Shield.
Once the OGN rules were changed, the Bullets merged with their sister team, the Arrows, to create KT Rolster. With Rookie's departure from the organization, Nagne filled in the starting mid lane role. KT participated in SBENU Champions Spring 2015 and placed fifth, narrowly missing playoffs. Edge was called up to the starting roster prior to the start of SBENU Champions Summer 2015 to share the starting mid lane position with Nagne. KT placed second overall during the regular season of Champions Summer. They made it to the finals of the playoffs but lost 3-0 to SK Telecom T1. KT earned enough circuit points to qualify for the 2015 Season Korea Regional Finals where they beat the Jin Air Green Wings 3-1 in the finals to qualify for the 2015 Season World Championship. KT was drawn into a group with LGD Gaming, Team SoloMid, and Origen. They ended with a 5-1 record and went on to play the KOO Tigers in the quarterfinals. Unfortunately, they lost 3-1 and were knocked out of the tournament.
KT played in the 2015 LoL KeSPA Cup where they lost 2-1 in the semifinals to CJ Entus. Nagne left KT on December 1st.
Nagne joined the Chinese team Wan Yoo in May 2016.