It appears that the Moon administration wants to treat the balloon launch human rights activists like they do conservative journalists by threatening them with jail:
The unification ministry said Wednesday that it will file a complaint with police against two North Korean defector groups for sending anti-Pyongyang leaflets across the border, a day after the North cut off all inter-Korean communication lines over such leafleting.
The ministry said that it will also take action to revoke business permits granted to the groups, Fighters for Free North Korea and Keunsaem, accusing them of putting the safety of people living in border regions at risk by sending leaflets into the North.
“They have violated public interests by heightening tensions between the South and the North and by running squarely against the agreements reached by the leaders of the two Koreas, and also caused danger to the lives and safety of residents in the border regions,” the ministry said in a press release.
Yonhap
You can read more at the link, but this is once again another example of how South Korea is a rule by law nation and not a rule of law nation. These activists have been doing this for years and one of their leaders Park Sang-Hak has faced assassination attempts by North Korean agents and had leftist thugs assault him to stop his balloon protests. Now with a change of government and complaints from North Korea, what they are doing is suddenly illegal.