Ji Chang Wook, Park Min Young and Yoo Ji Tae sends their Christmas greetings to everyone in a video released by OBS. They appear at the 22sec mark.
Have an enjoyable Christmas. Merry Christmas!
Your two admins at the Kitchen also wish everyone a happy and blessed Christmas ^__^
Video source:
OBS
Ji Chang Wook's Kitchen 
~MERRY CHRISTMAS ~ thanks for keeping us up date,
Merry Christmas!! 🎄🎅⛄️❄️🎁✨
MERRY CHRISTMAS TO ADMINS!
Thank you for keeping us updated. Merry Xmas to Ji Chang Wook’s kitchen!