As well as humans for workorsex (another area of competitive advantage for women entrepreneurs), the Chinese pay for medicinal herbs foraged in North Korea's hills, furs and drugs (methamphetamines).
It's also that trans folk in general will often find themselves joining vulnerable groups in other ways, such as having to resort to sexworkor living in dodgy areas because we've lost our jobs, our homes and our families.
Some reports find the government complicit in the slave trade of black Christians, who are purchased and forced to work as servants, laborers orsex slaves.