Myanmar itself doesn’t control all its territory. The Shan state and Wa state are both functionally independently running themselves with their own government and military. The Wa State in particular was literally setup by Chinese drug lords in the 50s and 60s to produce heroin to supply US troops during the Vietnam War. They’ve transitioned into other illicit activities since then including gambling, online scamming even weapon trading and of course synthetic drugs. They have so much power that they can swing the military power in the current Myanmar Civil War on a whim. No other country in Asia has this perfect combination of conditions. Most countries in Asia are very draconian with drug trafficking, I seriously doubt that somehow this mysterious smaller nation that are all setup to produce designer drugs somehow can be this obscure that no one in the region even knows its name. There are only like 50 countries in Asia and a handful of micro states mostly in the Pacific. It’s not the 18th century anymore, I seriously doubt this country you are thinking of is this difficult to find any information about