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![WATCH: Taeyeon drops 'Nights Into Days' MV](/_next/image?url=https%3A%2F%2Fdzrh-bucket.s3.ap-southeast-1.amazonaws.com%2Ffeaturedimage%2Ftaeyeon-drops-%2527nights-into-days%2527-mv%2FFn8znmhaAAEIdiP.jpg&w=3840&q=50)
Girls Generation's Taeyeon is once again blessing everyone with a soulful ballad song.
On Thursday, Taeyeon dropped the music video for her new song "Nights into days."
The single was written and produced by Soul Yoo Naul, a South Korean singer and member of the Brown Eyed Soul.
The "Nights into days" is part of Naul's 'Ballad Pop City' project.
In a message to her fans, Taeyeon said she likes Nail and has been a fan of him for a long time.
"I'm so happy to be able to work with him like this. Guess that I'm a successful fan," she said.
Taeyeon shared that the songs of Brown Eyed Soul became her "only small-but-certain happiness" during her schedules with Girls Generation,
"The day before yesterday, when I took a walk with Zero, I kept replaying 'Nights into days,' and it's really warming," Taeyeon said.
"I felt so happy listening to both Naul-nim's version and my versions of the song," she added.
Taeyeon debuted in the nine-piece group Girls Generation in 2007.
She embarked on a solo career in 2017 with her first mini-studio album "My Voice."
The 33-year-old singer is known for her outstanding vocals.
Watch the full music video here: