The whole world is talking about Kim Jong-un's sister.

Kim has a strong connection with the sister who has finished her schooling with her in Switzerland in the 1990s, broadcasts newspapers.net, and today they work together, keeping the hierarchy secret.

These days Kim Yo-jong 30) arrived in South Korea to personally transfer her brother's message to South Korean President Mun Yi. In view of the close relationships, brother and sister, it is quite certain that the response of the president of South Korea will be transferred almost immediately to the leader of North Korea.

Her visit to South Korea, which is a formal occasion for the Winter Olympics, is of historic importance. None of the Kim Jong family ever traveled to Seoul.

In 2002 the only one who had traveled south was Yang Song-thaek, who killed them in 2013.

In a period in which Kim Jong empowered his power, his sister entered the hierarchy and became deputy director of the ruling Party's propaganda sector, taking responsibility for overseeing state media and cultural issues.

In October of last year, she was appointed political deputy, the highest decision-making body. The appointment was used to further strengthen the power of the Kim family

In view of the fact that family ties are more important than anything in North Korea, few people in Pyongyang have a position as powerful as Kim Yo-jong currently has.

According to analysts, she is head of Kim Jong's cabinet, supervises access to the supreme leader as his guardian, and determines the schedule of public obligations. Too often it appears with him.

These two have the same mother, Ko Jong-hee, and of course they're very close. They spent several years in Switzerland after 1996, where they were educated at a school in Bern. According to reports at the time, during their stay in the West, both were closely monitored.

And the former leader Kim Jong-il reportedly had a very high opinion of his daughter and highly appreciated her interest in politics, which she had shown very early.

In January, the United States placed Kim Jo-dong on a blacklist, accounts and real estates closed in the United States, while citizens of America were banned from any business co-operation with them.

Among the reasons America has made this decision has been the violation of human rights that North Korea makes its citizens.

The North Korean leader invited South Korea's President Ms Yi to the Phoenix Summit, while his sister has extended the invitation to the leader.