

The last scene was the same ending as the music video of " TT". Producer Park Jin-young, founder of JYP Entertainment, also had a short appearance. The music video featured Twice having fun in a slumber party and snowball fight. 10 on 2017 YouTube's Top Trend Music Video in Japan. It was the most viewed K-pop music video for the first half of 2017, and topped YouTube's Most Popular Music Video in Korea of that year. 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. Stop-motion effect was used in some of the scenes in the video. The music video for "Knock Knock" was directed by Naive Creative Production.
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It was also released for digital download on various music sites. The music video for "Knock Knock" was officially released the next day in conjunction with the release of the album. Twice also greeted the fans via Naver V Live for a comeback countdown at 23:30 KST. The final group image teaser was released on February 19 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.

Two music video teasers for "Knock Knock" were released on February 17 and 18 at midnight. 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". On January 18, 2017, it was reported that Twice would be releasing a special album after their concert in Seoul. Problems playing this file? See media help.

"Knock Knock" is a bubblegum pop song with rock, disco, and electronic influences.
