Knock Knock (Twice song)

The song was released by JYP Entertainment on February 20, 2017, as the album's lead single.

It was written by Shim Eun-jee, Lee Woo-min "Collapsedone", and Mayu Wakisaka.

In early February, Twice officially announced the release of the reissue of Twicecoaster: Lane 1, titled Twicecoaster: Lane 2, on February 20 with a newly recorded track titled "Knock Knock".

Producer Park Jin-young, founder of JYP Entertainment, also had a short appearance.

[18][19] The following week, the song dropped to number two on the Gaon Digital Chart,[20] selling 141,204 downloads and gaining 6,965,178 streams.

[21][22] The single additionally peaked at numbers 5 and 15 on the World Digital Song Sales and Japan Hot 100, respectively.

[30] The next day, Twice recorded their appearance on the February 25 episode of You Hee-yeol's Sketchbook, their first variety show for Twicecoaster: Lane 2.

The group's appearance was included in the show's special monthly episodes with the concept "Songs I want to sing for those in their 20s.