South Korea's OEM refers to the goods from South Korea or China, which are delivered to the buyers of the two countries by manpower. Generally, they live on passenger ships that go back and forth between the two countries and transport goods back and forth, but they don't go through customs, which saves the buyer's customs duties and complicated import and export procedures (equivalent to express delivery), which is cheaper than international express delivery. Generally, they can take dozens of kilograms of goods at a time, and the charges are calculated by kilograms.