He has played for a number of youth-level teams representing South Korea, and in 2013 graduated to his country's senior men's side, winning the EAFF E-1 Football Championship in 2017 and 2019 as well as gold medal at the 2014 Asian Games.

His professional debut came almost immediately, in his club's second K-League match of the season against Ulsan, which ended in a 1–0 victory for Gyeongnam.

[2] In January 2020, following the expiry of his contract at Yokohama, Yun moved to Europe where he joined the French club Montpellier on a free transfer.

[7] Yun was also called up for duty with the South Korea U-23 team, playing in a friendly against Uzbekistan in which he scored a goal[8] as well as an Olympic Final Qualifier against Qatar in November 2011.

[9] Yun has since graduated to the senior men's squad, scoring a goal in the EAFF East Asian Cup against Japan in his sides 2-1 loss on 28 July 2013.