On 9 March 2010, Yun made his professional debut AFC Champions League against Melbourne Victory, scoring Seongnam's second goal in away won 2–0.

[3] Yun made his K-League debut on 19 March away against Jeonbuk Hyundai Motors, coming on as substitute for Kim Jin-yong in the 72nd minutes.

[4] He was linked with Chinese Super League side Henan Jianye in January 2014, however, his transfer was blocked after failing to pass the physical examination.

In May 2018 he was named in South Korea's preliminary 28 man squad for the 2018 FIFA World Cup in Russia.

This biographical article related to a South Korean association football defender is a stub.