Choi Sung Min

In October 2010, Sung Min debuted with Coed School under Core Contents Media. By 2013, Coed School was no longer active, allowing Sung Min to leave the group. On January 7, 2013, Sung Min debuted in a sub-group of Coed School, SPEED, with the digital single "Speed of Light".

The group presumably disbanded in 2015 when the group profile was removed from the company's website. On September 15, 2016, it was announced that Sung Min has signed an exclusive contract with Star Camp 202 and he will be promoting as an actor. On September 16, 2021, it was announced that he has signed an exclusive contract with Management Air.