There has been concern in South Korea that a Trump presidency will demand that Seoul sharply raise its share of the cost of maintaining the US military presence in the country.
Although Mr Trump has not laid out a clear direction for his policy on North Korea, he has indicated that he would be open to negotiations with its leader Kim Jong Un to talk him out of his nuclear ambitions.
Trump made the commitment during a phone call with South Korean President Park Geun-hye on Thursday.
A Trump spokesman said in September that North Korea's most recent nuclear test was an example of the "catastrophic failures" of his Democratic rival, former Secretary of State Hillary Clinton.
Consider it a North Korean welcoming for the next U.S. president.
He ordered them to 'eliminate the human filth occupying the [South Korean] presidential Blue House, military and the puppet government, all who have committed crimes that can not be forgiven for all of eternity'.
"We are going to be with you 100 percent", Trump said, according to a statement from South Korea's Blue House. During the presidential campaign, he repeatedly said South Korea doesn't pay enough for its own defense and the presence of US troops in Korea doesn't guarantee peace.
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Trump added that Washington will work together with Seoul "until the end" for the security of the United States and South Korea, according to the official.
The US already operates on a "worst-case" assumption that Pyongyang could potentially launch a missile with a nuclear weapon on it that could strike Alaska or Hawaii.
"I would like to congratulate Trump on his election, and hope this will be an opportunity for the development of the ties between South Korea and the United States", he said.
South Korean government officials have reportedly been working to assess how the Washington alliance might change in the wake of Trump's victory.
British Prime Minister, Theresa May also got her chance to talk to the President-elect this afternoon - but only after he had spoken to the leaders of South Korea, Japan, Egypt, Australia, India, Turkey, Israel and Mexico.
South Korea's Defence Ministry spokesman Moon Sang-gyun said on Thursday the country has paid for its share of the cost of maintaining the USA military and the contribution has been recognized by the US government and Congress.
"Trump's guiding principle has been to put American interests first", Cha said in a commentary issued Wednesday.