In early 2018, Park and her fellow T-ara members left MBK Entertainment when their contracts finished. While they stated they would stay together as a group, they have not released any new music as a group since then. In May 2018, Park joined Chinese agency Longzhen Culture Development. She then made a song with Vietnamese singer Soobin Hoàng Sơn. The title is "Between Us". In November 2018, she signed with Partners Park for her work in Korea. In December 2018, Park made music videos for her song "One Day"