If South Korea wants to unlock access to South American trade, it will need to prove it is not a competitor interested only in extracting natural resources but a trustworthy partner committed to revitalising manufacturing industries, according to observers.On Monday, South Korean President Lee Jae Myung and Brazilian President Luiz Inacio Lula da Silva agreed to revive negotiations on a free-trade agreement between South Korea and Mercosur, the South American trade bloc.A joint working group...