The album, "I," will be released through local online music sites at midnight Oct. 7, the agency, SM Entertainment, said.
SM unveiled a teaser for the upcoming album on Taeyeon's official website and its Facebook account early Wednesday.
Taeyeon plans to hold concerts as a soloist at the SMTown Theater of COEX Artium in southern Seoul, on Oct. 23-25 and Oct. 30-Nov. 1 to promote the album, the agency said.