This is kind of what I was wondering as somebody who's 99% clueless about Korean politics.
Yoon Suk Yeol claimed he is protecting the country from "shameless pro-North Korean anti-state forces."
Now...
I do not doubt that NK has spies in SK, possibly some in government. I am sure there are some in SK who are happy to get a paycheck from NK to share some info. It's what any oppositional nation state would be trying to achieve.
But as far as literal "pro-North Korean" forces in SK, that seems close to literally impossible to me.
I cannot imagine any significant number of South Koreans looking at North Korea and thinking ooooh yes that is what I want.