This is a scam, but the Yoon administration is being accused by their critics of not responding forcefully enough to a terrorist attack:

Concerns about possible terrorist acts using chemicals continued over the weekend amid an investigation into suspicious international packages delivered to hundreds of seemingly unrelated Korean addresses.
Korea Times
In a message to the public, police warned against opening the parcels labeled with “CHUNGHWA POST,” as they could contain toxic materials. So far, more than 640 such packages sent via Taiwan were confirmed to have been delivered to addresses across the nation including Jeju Island since Thursday. Police said all of them are now under scrutiny.
An X-ray scan raised an alarm early Sunday over a potentially harmful gas inside a package delivered to a home in Cheonan, North Chungcheong Province. But after an additional inspection, police later said they found no such gas.
The mysterious parcels have stoked fear and confusion since last Thursday when three staffers at a care center for the disabled in Ulsan said they experienced dizziness and difficulty breathing after opening one. The Agency for Defense Development, a government agency for research and development in defense technology, later concluded that there was nothing unusual in the box.
The packages were sent to Korea via Taiwan with consumer products such as mascara in them:
Some security experts have raised the possibility that scammers may be behind the mystery, such as a “brushing scam” which refers to online retailers sending unsolicited goods to random people as a means of generating positive reviews or boosting their online presence.
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