Taeyeon has dropped another teaser for "Nights Into Days".

In the preview video above, the Girls' Generation member reveals a snippet of her vocals for the upcoming ballad. Produced by Naul, "Nights Into Days" is the next release from his special project series 'Ballad Pop City', which seeks to produce classic Korean ballads, and it's set to drop on February 2 KST.

Listen to Taeyeon's "Nights Into Days" teaser above, and let us know what you think in the comments below.