Twicecoaster: Lane 2 (stylized as 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 13 tracks, including the lead single, "Knock Knock".

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 13 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 for "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.

The music video for the title track "Knock Knock" was directed by Naive Creative Production. Stop-motion effect was used in some of the scenes in the video. It earned almost 10 million views on YouTube within 24 hours since its release and set a new record for the fastest K-pop group music video to reach 30 million view count in only 152 hours.

A sense of innocence was portrayed in the music video, which featured Twice having fun in a slumber party and snowball fight. Producer Park Jin-young, founder of JYP Entertainment, also had a short appearance. The last scene was the same ending as the music video of "TT".

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