CST (씨에스티), formerly known as Cinqswan, was a South Korean-Singaporean four-member girl group under Dreamcense. They debuted on June 12, 2018 with the release of their first and only digital single, "Be You". Initially known as 'Cinqswan', the group was formed sometime in 2011. As a dance group, they primarily worked on dance and vocal covers on live stages for events. In the later half of 2016, the group gained some fame while touring in Singapore, Indonesia, Malaysia and Thailand as they become known for their 2NE1 covers. By 2017, the group had four-remaining members, Jina, Haelim, Heewon and Sunny.