Under the deal, South Korea will invest $350 billion in key U.S. industries and purchase $100 billion worth of its liquified natural gas.

Among the advice they received? Call Trump a "great person" and speak as simply as possible, Industry Minister Kim Jung-kwan told reporters in Washington after the deal was announced on Wednesday.

Country agreed to invest $350-billion in the U.S., purchase $100-billion of liquefied natural gas and other energy products, President says