Officials in Tokyo suspect the North is trying to chip away at the united front that groups the USA together with its East Asian allies amid biting worldwide sanctions on the hermit country.
North Korea is number one on the 2018 Open Doors World Watch List, which ranks 50 countries where it's the most hard to live as a Christian.
The nuclear-armed dictator was identified by The Telegraph as an Australian musician named Howard, while his spray-tanned companion was played by American Dennis Alan.
"I thought things would be odd and very different, but I found a lot of things being similar", Kim Yo-jong said while proposing a toast at last night's dinner, according to Moon's office.
USA officials have been urging South Korea to be cautious in its rapprochement with the North.
It was the US that appeared to be the one left in the cold, especially after the sister of the North Korean dictator extended an invitation from her brother for Moon to visit the North.
About the necessary "preparations" for a summit, the Blue House said the two countries should work toward the swift restoration of their relationship, and toward early dialogue between North Korea and the U.S.
Man with Sword Attacks Church in Yogyakarta, Injures Four
Three months later, a church in Samarinda, East Kalimantan, was struck by a homemade bomb which injured four people. Churches are a common target for Islamic militants in Indonesia, the world's most populous Muslim nation.
US Vice President Mike Pence and his wife were seated beside the Moons and next to Japanese Prime Minister Shinzo Abe and his wife.
The delegation will return to North Korea on Sunday.
The sister of North Korean leader Kim Jong Un says a summit between her brother and South Korean President Moon Jae-in would pave the way for a fast improvement in ties that would make "yesterday seem like a long time ago".
While Tokyo has not condemned recent talks between the two Koreas insofar as they concern participation in the Pyeongchang Games, it has also warned against North Korea's "charm offensive". The two leaders vowed to resolve the nuclear issues by implementing the 2005 deal; end military hostilities through dialogue; replace the current armistice signed after the Korean War with a permanent peace regime; and expand business cooperation by building new joint economic zones, among others.
But Pyongyang's nuclear programme will hang over any attempts to bring the countries closer together.
The two Koreas, which remain technically at war since their 1950-53 conflict ended in an armistice instead of a peace treaty, have only had two previous summits.