Kang Ji Wook

On October 28, 2010, he made his debut in the co-ed group Coed School with the digital single "Too Late". In 2012, he made his debut as the leader of SPEED, Coed School's male sub-unit with the release of their pre-debut single "Hommage to Lovey-Dovey". He left Coed School and SPEED in October 2012.

On March 26, 2018, he made his debut as the bassist in the male duo LE CIEL with the digital single "Sweetune". The duo quietly disbanded after the end of debut promotions.