It is unlikely that you have an allergy to beer or to alcohol. Although there are rare cases of documented allergies to alcohol, this is very uncommon. However, another condition is quite common. This is a deficiency in an enzyme called acetaldehyde dehydrogenase.
North Korea runs trading companies in Thailand, Hong Kong, Macau and Cambodia, which export North Korean goods - mostly clothing, plastics and minerals such as copper - to the region.
Why do China and South Korea trade with North Korea? South Korea and China have maintained trade with North Korea as a means of enhancing their prosperity and security. South Korea and China both seem to recognise that sanctions only serve to further isolate the already reclusive North Korea.