anyone know why MBC is not currently airing any dramas?  I tried to look online to find some  articles but couldn't find anything

They are! 

This one is currently airing: https://mydramalist.com/79797-be-a-meal

This one will start soon: https://mydramalist.com/69915-oh-master

You can find the ones that will start later this year here: https://mydramalist.com/search?adv=titles&nt=2&re=2021,2021&so=relevance