Yoon Suk-yeol's martial law is no match for a declaration of war between North and South Korea

Scenario
If North Korea conducts live fire on the eastern front
President Lee Jae-myung will definitely declare war
In that case, Yoon Suk-yeol's martial law won't stand a chance
I am curious about the People Power Party's reaction
Lee Jae-myung, prepared for war
In the event of war, President Lee Jae-myung will
Take down all members of the People Power Party
who were said to be walking on eggshells around North Korea
and focus on the downfall of North Korea