Taeyeon has dropped a teaser video for "Nights Into Days".

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. The teaser video reveals a preview of the upcoming track with a swelling orchestra.

"Nights Into Days" is due out on February 2 KST. Check out the teaser above, and let us know what you think in the comments below.