Moon made Östersunds FK debut, where he started the whole game, in a 1–1 draw against IK Sirius in the opening game of the season.[10] He appeared in two more matches before being sidelined for a month with a toe injury.[11] It wasn’t until on 16 June 2012 when Moon made his return from injury, coming on as a 62nd minutes substitute, in a 1–0 loss against IK Frej.[12] In a follow–up match against BK Forward, he scored his first goal for the club, in a 2–1 loss.[13] Moon then scored his second goal of the season on 14 July 2012, in a 1–1 draw against Västerås SK.[14] Since returning to the first team from injury, he regained his first team place and helped the side win the Division 1 Norra and promoted to the second tier Superettan in the 2012 season.[15] At the end of the 2012 season, Moon went on to make twenty–five appearances and scoring two times in all competitions.[16]