"Heart Shaker" is a song by South Korean girl group Twice. It is the first and title track in the group's repackage album, Merry & Happy. The single and its music video was released on December 11, 2017.
TWICE won the December Digital Music Awards 2017 with "Heart Shaker" in the 7th Gaon Chart Music Awards.
- The music video has now more than 125 million views.