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Zhang's debut was anticipated not only in South Korea, but all of Asia, due to S.M. Entertainment's advertising of her being the "Chinese BoA" as well as Lee Soo-man himself stating he was training her to be the next leader of the Korean Wave. Before her official debut, it was already known that her first song was a duet with popular TVXQ member Xiah, which generated even more interest in her. Before the official release of her single, "Timeless" was available for free download between August 31 and September 6 on her official website. "Timeless" is a South Korean cover of the original single by Kelly Clarkson and Justin Guarini.