Many are also selling grain are shown using Red Cross logo sacks that have "Presents from South Korea" imprinted in Korean language.
"The people know that they receive aid from the South. The state used to hide that, but since several years ago the officials themselves are the culprits, smuggling aid out of the system into the black markets," said K.S. Lee, 48, a North Korean refugee who settled in Seoul, South Korea, two years ago.
South Korean local media have reported this month quoting sources in the North that markets are slowly opening up again, but analysts say the state of North Korean economy is still in chaos. "They are trying to sort out the situation but at the moment it looks like they are now hoping to turn to China for economic assistance," said Jeong.
ABC News' Wookyung Chloe Jung contributed to this report