She sung "Bye" for the movie 'Mister Go', and she revealed that it was her first time ever singing a song for a movie. 

SEE ALSO: Girls' Generation's Taeyeon to sing "Bye" for 3D-film 'Mister Go' OST

Taeyeon had said, "Just as '200 Pound Beauty' and 'Take Off', are films with impressive background music and cinematography, I've always wanted to take part in a production by director Kim Yong Hwa. I'm already getting excited from thinking about hearing my song on the big screen while 'Mister Go' is playing."

'Mister Go' tells the inspirational story of a 15-year old girl Wei Wei and her gorilla Ling Ling that joins the Korean professional baseball league. The film will premiere on the 17th!

Tip: Xesyre