At the beginning of the North American summit, there was a discussion on third countries such as Pyongyang, Panmunjom and Mongolia in addition to Singapore. Of these candidates, Singapore was the final choice
First of all, Singapore seems to be a representative neutral country.
Singapore is a diplomatic neutral zone where both the United States and North Korea interact.
Both embassies are located.
Washington Post commented on Singapore that it "has diplomatic ties with North Korea, has a North Korean embassy, and has conducted smoothly diplomatic activities in third countries in Asia."
In fact, in 2015, the first summit meeting between Chinese President Hu Jintao and Taiwanese President Ma Ying-jeou was held in Singapore.