Kim Chang-sun is said to be the only person with exclusive access to meet with Kim Jong-un in his office and appears to wield considerable influence over his decision-making.(AFP)

Kim Yong Chol paved the way for the US-North Korea summit through secret negotiations with South Korea and the United States.

(Beijing News) From the Pyeongchang Winter Olympics in February to the inter-Korean summit meeting and then to the U.S.-North Korea summit, this drastic change has even surprised experts. North Korea, which has always been closed, has to open the door without mentioning two key figures, namely North KoreaThe confidant of the supreme leader Kim Jong-un, the vice-chairman of the Central Committee of the Workers' Party Kim Yong-chol, and the minister of the State Council Kim Chang-sun, who is known as the butler of the Kim family.

Japan's Kyodo News Agency reported that Kim Jong-un has held summit talks with Chinese leaders and South Korean President Moon Jae-in since March, and the only person who accompanied him to all these talks was Kim Yong-cheol.Diplomatic sources pointed out: He is a key figure in a series of summit diplomacy.

That is, Kim Yong Chol flew to Washington and handed over Kim Jong Un's personal letter to US President Trump, which finally re-confirmed the US-North Korea summit that was canceled by Trump.

Kim Yong Chol is the first director of the Reconnaissance General Bureau, the North Korean intelligence agency that conducts espionage activities against the United States and South Korea.The road to the US-North Korea summit.

As for Kim Chang-sun, he has served in the secretary's office who has assisted the supreme leader since the time of the late North Korean General Secretary Kim Jong-il.In the process of preparing for the U.S.-North Korea talks, he was in charge of negotiating with the U.S. on Kim Jong-un’s security work, which is the most important aspect of North Korea.

Tae Yong-ho, the former North Korean minister in exile in South Korea, confirmed that the contents of the reports of all state agencies were reported to Kim Jong-un through the secretariat.Kim Chang-sun, who had been the head of the secretary's office until now, is said to be the only one with the authority to meet with Kim Jong-un alone in his office and appears to have great influence on decision-making.

The secretary's office has always been shrouded in mystery, and Kim Chang-sun, who is at the core, came to the stage. Diplomatic sources pointed out that he is the core figure of North Korea's unprecedented active diplomacy.