Two months later in late–August, Moon was called up to the national squad once again. He made an appearance for the side, playing 22 minutes, in a 2–0 win against Costa Rica on 7 September 2018. Two months later on 20 November 2018, Moon scored his second goal for the national side, in a 4–0 win against Uzbekistan. A month later, however, he was cut from the 23-man squad ahead of the Asian Cup in Qatar. A year later, Moon was called up to the national team for the EAFF E-1 Football Championship as South Korea was the tournament host. He appeared in every matches for the national side in the tournament, as South Korea won the EAFF E-1 Football Championship after winning all three matches.