Not Alone (我一个人) is Zhang Liyin's fourth overall single, released on August 20, 2014 in China and August 22 in South Korea. The song is a remake of 'By Myself' from the SBS drama Ja Myung Go which Girl's Generation member Tiffany sang back in 2009. Zhang Liyin had mentioned that the song is a follow up track and a continuation of the storyline of Agape during her YouTube Interview with Victoria and Tao. In a press release from SM Entertainment on September 18, they announced that the song will be Zhang Liyin's fourth single. It was released on September 20, 2014 in China through Baidu and then later released in South Korea through Korean music sites MelOn, Genie, Naver and Bugs on September 22. Zhang held a showcase to support the release of the single, which was held at the Century Theater in Beijing. EXO members Tao and Chen were guests at the said event.