Junhyung rose to fame as a member of South Korean boy band Highlight (formerly known as Beast), formed in 2009.

He departed from Highlight in 2019, amidst a controversy where he admitted to having watched a video of singer Jung Joon-young making out with a woman, which was filmed with consent but shared without.

"[14] In 2011, Junhyung was featured on the songs "Heartsore Story" by Wheesung,[15] "A Bitter Day" by Hyuna,[16] "Be Quiet" by Kim Wan-sun,[17] and "Don't Act Countrified" by ALi.

[21] Later that year, Junhyung produced fellow Beast member Yang Yo-seob's debut solo EP, The First Collage, and was featured on the lead single, "Caffeine.

[24] Starting in May, Junhyung starred in the Korean drama Monstar, alongside Ha Yeon-soo and Kang Ha-neul.

[30] In 2015, Junhyung starred in the Cube Entertainment online reality series, Yong Jun-hyung's Good Life, alongside his songwriting and music production partner Kim Tae-joo.

[43] On September 27, 2022, it was announced that Junhyung would be releasing a new album in the near future, which would be his first solo comeback in four years and also his first since his departure from Around Us Entertainment.

[46] However, the label announced the postponement of the album due to the national mourning period following the Seoul Halloween crowd crush incident on the 29th.

[50][full citation needed] On March 11, 2019, the television program SBS Eight O'Clock News incorrectly reported that Junhyung was part of a group chatroom where musician Jung Joon-young shared hidden camera sex videos with acquaintances.

[51][53] Seoul Metropolitan Police stated in April that they questioned him as a witness in the Jung Joon-young KakaoTalk chatrooms case.

[2] On March 7, 2022, Yong donated 10 million won to the Hope Bridge Disaster Relief Association to help the victims of the massive wildfire that started in Uljin, Gyeongbuk and has spread to Samcheok, Gangwon.