Choi Sung-min was born on December 7, 1995, in Yanggu, Gangwon Province, South Korea.
Choi made an appearance on the SBS variety show Star King before being recruited by MBK Entertainment and becoming the tenth member of Coed School in 2010.
[3] The unit later became an independent group after Core Contents Media disbanded Coed School.
On June 26, 2016, Sungmin signed a contract with the talent agency Star Camp 202 to pursue his acting career.
[citation needed] It was revealed by his sister Choi Ye-na that he has enlisted to Korean military in July 2019.