Winter (Korean: 사춘기 하; Hanja: 思春記 下; RR: Sachun-gi Ha) is the second studio album by South Korean brother-sister duo, AKMU.

On December 22, 2016, YG Entertainment uploaded a poster that announces the release of AKMU's 20-minute long musical short film Spring of Winter, and announcing the release of the duo second full album Winter with the date set on January 3, 2017.

[1] On December 28, 2016, The full track list was revealed, with Lee Chan-hyuk producing and writing all the songs on the album.

[2] AKMU held Special Music Event: Winter Theater on December 28, 2016, a special event with the fans to listen to their new songs from the album before releasing it.

[3] On January 1, 2017, a short musical film was released.