Kim "Pure" Jin-sun was picked up as a sub for NaJin White Shield in March 2014. His only professional games with the team were during SK Telecom LTE-A LoL Masters 2014.
With the changes to the OGN rules, Shield and their sister team, NaJin Black Sword, were forced to merge, forming NaJin e-mFire. With Shield's previous support, GorillA, departing from the team, Pure was given a position on the starting roster. During SBENU Champions Spring 2015, Pure shared the starting support position with Sword's long time support, Cain. NaJin's poor performance in Champions ended when they missed playoffs and ultimately placed in sixth. NaJin placed fifth in the regular season of SBENU Champions Summer 2015 and qualified for the playoffs but they lost in the first round 2-1 to the KOO Tigers. They earned enough circuit points to make it to the 2015 Season Korea Regional Finals but lost 3-0 in the first round to the Jin Air Green Wings.
NaJin played in the 2015 LoL KeSPA Cup where they lost 2-1 to Rebels Anarchy in the first round. Pure left NaJin in November. He joined Incredible Miracle on December 29th. 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. Pure shared play time with fellow support Zzus. 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.