Seoul (CNN) South Korean President Moon Jae-in has a message from President Donald Trump to relay to North Korean leader Kim Jong Un, South Korean diplomatic sources told CNN Friday.

The message includes "things that matter to the current course of action, things that have to lead to something positive for the US-DPRK summit," a source said. "I believe he (Kim) would be very, very curious about what my President (Moon) would have to say after his meeting with the Trump administration."

"President Moon has been clear and simple. Small deal, big deal, good or bad, something has to happen, the process has to be sustainable," the source continued.

CNN has reached out to the White House for comment.

Trump and Moon met at the White House a week ago to discuss plans for reviving the diplomatic process between the US and North Korea.

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