[4][5] Large photos and ads of Twice were seen on the walls of busy shopping districts and subway stations in Tokyo on February 8.

It was revealed then that they would release a compilation album titled #Twice which consists of 10 songs including both Korean and Japanese-language versions of "Like Ooh-Ahh", "Cheer Up" and "TT".

[8] On the same day, five Japanese morning programs informed viewers of the upcoming debut and featured Twice in an interview.

[10][11][12][13] On June 7, Warner Music Japan uploaded a short video of Twice recording the Japanese version of "Like Ooh-Ahh" on YouTube.

[2][17] On June 14, 2017, it was announced that Twice would have a collaboration with Shibuya 109 store's 109 Summer Sale campaign for 2017 to mark the album release of #Twice.

On June 29–30, letters "TT", which represent the title track, were displayed in bright pink lighting on the Japanese tourist destination.

[35] It also peaked at number 2 on Billboard Japan Hot Albums, recording 137,642 copies sold, and it charted for 25 weeks in 2017.

[41] On December 4, it was announced that #Twice topped Tower Records Japan's 2017 best-selling domestic albums by K-pop artists.

According to Billboard's Jeff Benjamin, "This is likely due to the fact it was available on all streaming platforms, like Spotify where the group's full Korean discography was only added in 2018, as one of the few ways for fans to listen to their hit songs, even if in Japanese.