Kim Yo-jong, who serves unofficially as one of Kim Jong-un's top aides, warned Seoul of the potential consequences of such an attitude in a statement carried by state news agency KCNA on Wednesday.
The reaction came days after South Korean Foreign Minister Kang Kyung-wha said it was "hard to believe" that that the there were no coronavirus outbreaks in the North, and that Pyongyang had been unresponsive to Seoul's offers of help to tackle the disease.
The pandemic "in fact has made North Korea more North Korea -- ie more closed, very top-down decision-making process where there is very little debate on their measures dealing with COVID-19,” Kang said at a forum in Bahrain on Saturday.
"All signs are that the regime is very intensely focused on controlling the disease that they say they don't have,” she stated.