Singer Ailee has signaled a pleasant end to 2019.

Ailee appeared as a guest in the evening section of KBS Cool FM's "I'm Lee Geum-hee on a Good Day to Love," which aired on the afternoon of November 25.

Ailee said, "I'm releasing a season song on December 12. So I'm going to release my season song "Sweater." It's a warm song," she said, announcing the release schedule for the surprise album.

Moreover, Ailee said, "We are about to make inroads into the U.S., and the local manager of our agency's global division has come. He's going to take charge of me from now on. I've been preparing for a long time," she said, as well as the news of her U.S. debut, "I'm going to a concert and I'm going to have a concert with my fans in Korea. It starts on December 7," she said, even missing out on promoting the concert.

In addition, Ailee proved that she was still a song of vocal power in the live stage of the album 'BUTTERFLY' and 'Ain't That Pretty'.

Along with the release of this winter's album, Ailee will host national tour concerts "IAM: RE-BORN" in Incheon from Dec. 7, Gwangju on Dec. 14, Suwon on Dec. 24, Daegu on Dec. 25, Seongnam on Dec. 28, Daejeon on Dec. 31 and Busan on Jan. 5.