Twicecoaster: Lane 2 is the reissue of South Korean girl group Twice's third extended play (EP) Twicecoaster: Lane 1. It was released digitally and physically on February 20, 2017, by JYP Entertainment. It contains thirteen tracks, including the lead single, "Knock Knock". Background and release On January 18, 2017, it was reported that Twice would be releasing a special album after their concert in Seoul. In early February, Twice officially announced the release of the reissue of Twicecoaster: Lane 1, titled Twicecoaster: Lane 2, on February 20 with the brand new track "Knock Knock". The track list for Twicecoaster: Lane 2 was revealed on February 12. It contains thirteen tracks: the seven songs from the original release, additional two new songs, a remix version and instrumental of "TT", as well as the instrumental tracks of "Like Ooh-Ahh" from The Story Begins and "Cheer Up" from Page Two. The group concept images and individual teasers of Twice were released in the next four days. Two music video teasers for "Knock Knock" were released on February 17 and 18 at midnight. The first teaser started with the sound of knock which was heard on the ending of the music video for "TT", while the second teaser showed the members dressed in a variety of outfits that flash by in the stop-motion video. The final group image teaser was released on February 19 at midnight. Twice also greeted the fans via Naver V Live for a comeback countdown at 23:30 KST. The album, along with the music video for "Knock Knock", was officially released the next day. It was also released as a digital download on various music sites. Promotion On February 20, 2017, Twice had a live broadcast on Naver V Live at 20:00 KST to celebrate their comeback with fans. The group talked about the album, the title track "Knock Knock" and its music video, as well as their first solo concert which was held on February 17–19 and Asian tour. They also performed the full choreography of "Knock Knock" for the first time. The next day, Twice recorded their appearance on the February 25th 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." On February 23, Twice held their first comeback stage