In February 2015, MBK Entertainment formed a project group known as TS. It included Eunjung and Soyeon as well as members of other groups. The TS group made a winter single, titled "Don't Forget Me." In March 2015, T-ara was announced as the main performer for Malaysia's Sultan Of Johor Coronation celebrations in Johor Bahru. The group appeared at the event along with Sistar, and The Black Eyed Peas' Taboo.