"Knock Knock" is a song by South Korean girl group Twice. It is the first and title track in the group's first special album, Twicecoaster: Lane 2. The single and it's music video was released on February 29, 2017.


Music video

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".


Credits to:

Video Gallery


  • Knock Knock was produced by Lee Woo-min and Mayu Wakisaka, and written by Shim Eun-ji, Lee Woo-min and Mayu Wakisaka.
  • It is the first titled song that is not composed by Black Eye Pilseung, as all three previous titled songs are composed by them.
  • The music video has more than 170 million views.
Korean Studio Albums Twicetagram (Merry & Happy)
Repackage Albums Twicecoaster : Lane 2Merry & HappySummer NightsThe Year of Yes
EP The Story BeginsPage TwoTwicecoaster: Lane 1 (Twicecoaster: Lane 2)SignalWhat Is Love?Yes Or Yes (The Year of Yes)Fancy YouFeel SpecialMore & More
Special Albums Summer Nights
Title Tracks Like Ooh-AhhCheer UpTTKnock KnockSignalLikeyHeart ShakerWhat Is Love?Dance The Night AwayYes Or YesThe Best Thing I Ever DidFancyFeel SpecialMore & MoreI Can't Stop Me
Digital Singles Cry For Me

Japanese Studio Albums BDZ (BDZ -Repackage-)&TWICE (&TWICE -Repackage-)
Repackage Albums BDZ -Repackage-&TWICE -Repackage-
EP What's Twice?
Single Albums One More TimeCandy PopWake Me UpHappy HappyBreakthroughFanfareBETTERKura Kura

English Digital Singles More & More (English ver.)I Can't Stop Me (English ver.)
Tours Twiceland (2017)Twiceland ZONE 2: Fantasy Park (2018)TWICE 1st ARENA TOUR 2018 "BDZ"Twice World Tour 2019TWICE DOME TOUR 2019
Online Concerts TWICE: World In A DayTWICE in Wonderland
Online Series TWICE TVTWICE: Seize The LightTIME TO TWICE
TV Series SixteenTwice's Elegant Private Life
Agencies JYP EntertainmentWarner Music JapanRepublic Records
Covers I Want You Back
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