"Pyongyang Spirit: A drink you won't forget after drinking once," reads the text of an ad for a clear, vodka-like North Korean alcohol.

No country is further from Madison Ave than Soviet-style North Korea, but advertising is beginning to emerge as makers of goods try to pitch products to a rising group of consumers and a wealthy class of citizens.

From whitening toothpaste made from natural ingredients to sea-cucumber snacks that claim to fight cancer and tuberculosis, more goods are being sold in colorful ways to the growing class of "donju," or "masters of money," who generate wealth in a grey market economy that is allowed to operate but is not formally recognized.