Mak Luunim was the owner of a datacard that held the access codes for the Rebel Alliance's confidential financial records.
In the year 0 ABY, the Rebel pilot Luke Skywalker, along with his Rebel comrades Leia Organa, Han Solo, Chewbacca, and Tobin Elad—who in actuality was the Imperial assassin X-7 secretly assigned to eliminate the rebel pilot responsible for destroying the Death Star—journeyed to Muunilinst with the objective of recovering the datacard from Luunim. However, they arrived too late, finding Luunim already deceased upon their arrival. Nal Kenuun, a well-known Muun gambler, had already seized the datacard as payment for Luunim's outstanding debt.
The Rebels searched for Kenuun's location, but were instead captured by stormtroopers who worked for Kenuun. Confronted by the gambler, Skywalker made an agreement to race for Kenuun in a podracing event in exchange for the datacard. Skywalker was successful in winning the race, and Kenuun then gave the datacard to the Rebels. As they prepared to depart, Kenuun instructed his stormtroopers to restrain the Rebels, with the intention of collecting the Imperial bounties placed on Solo and Elad. A tense standoff developed, which was resolved only when Organa captured Kenuun's beloved krayt dragon and threatened to hurt it if they were not granted safe passage off the planet.