High4 (hangul: 하이포; stylized as HIGH4) is a former South Korean boy band under the management of N.A.P Entertainment. The group consisted of members Alex, Myunghan, and Youngjun. They officially debuted into the Korean entertainment industry on April 8, 2014 with the song “Not Spring, Love, or Cherry Blossoms” featuring IU. On January 31, 2017, it was announced that leader Sunggu would be leaving the group.
On August 16, 2017, Alex announced on his Instagram live that the members have gone their separate ways and they would have their own solo activities, confirming the disbandment of High4.
On November 9, 2017, it was announced that Youngjun would be competing on Mix Nine under a new agency named Eleven9 Entertainment.
On March 2018, Alex enlisted in the army.