TWICE has pushed back the release of their "Merry & Happy" MV.
Fans had requested a delay in the release of the MV originally scheduled for the 21st. The release on the 21st would have overlapped with the amount of time normally given to pay respects to the deceased. While not specifically stated, it looks like JYP Entertainment has decided that paying their respects is indeed the right thing to do, and has decided to push back the release one more day to the 22nd.
Look for "Meery & Happy" at midnight KST on the 22nd.