She delivered her brother’s surprise invitation for President Moon Jae-in of South Korea to visit the North for a summit meeting, and Mr. Moon met her four times during her three-day trip. She held her chin up when she met political leaders and faced crowds in the South.
Her light makeup and modest, even prim, clothes were a contrast to those of her fashionably dressed sister-in-law, Ri Sol-ju. “I can’t speak very well in public,” Ms. Kim said “shyly” when she was asked to give a toast during a dinner at a five-star hotel in Seoul, according to South Korean officials who were present.
Mr. Kim “expressed satisfaction” after Ms. Kim briefed him on Monday about her trip to the South.
“It is important to continue making good results by further livening up the warm climate of reconciliation and dialogue created by the strong desire and common will of the North and the South with the Winter Olympics as a momentum,” Mr. Kim said, according to the North’s official Korean Central News Agency on Tuesday.
Despite the intense curiosity her visit generated, little is known about Ms. Kim, a member of the most secretive ruling dynasty in the world. Outside officials are not even sure about her age or marital status, though she is most often said to be 30 and married.
Ms. Kim is the youngest child of Kim Jong-il, the North’s second leader, who died in 2011. She and Kim Jong-un studied in Switzerland as teenagers, using aliases. With a high forehead and sometimes aloof expression, Ms. Kim resembles her father more than her grandfather, the revered North Korean founder Kim Il-sung.
It was Ms. Kim’s father who first noticed her political acumen when she was still young, analysts say.
Back in 2001, when the Russian ambassador to North Korea asked Kim Jong-il which of his sons would become successor, Mr. Kim said that his sons were “idle blockheads” and that it was his daughters who he thought had the intellect and personality to be “reliable successors,” Michael Madden, an expert on North Korea leadership, wrote last week.
Certainly, when Ms. Kim was in Seoul last week, she was nothing but a charmer.
She is said to have told the South Korean leader that if he and her brother meet, “the North-South relations will improve so fast that yesterday would seem a distant past.”
“I wish I could see you again in Pyongyang soon,” she told Mr. Moon at a luncheon on Saturday, according to South Korean officials. “I wish that Your Excellency President will leave a mark for future generations by playing a key role in opening a new chapter for reunification.”
Vice President Mike Pence, who was leading the American delegation to the Olympics, warned that the North was trying to “hijack the message and imagery of the Olympic Games” with its “propaganda” and a “charm offensive.” Mr. Pence mounted a counterpropaganda campaign of sorts, meeting defectors from North Korea and bringing with him the father of Otto F. Warmbier, an American university student who died last year shortly after he was released from months of detention in the North.
But his efforts did little to stop the hoopla over Ms. Kim.
“Kim Yo-jong from the North was a nuclear bomb with a smile,” a conservative newspaper columnist wrote, lamenting the Moon government’s treatment of a member of a family condemned by the United Nations for widespread human rights violations.
Lee Sung-yoon, a Korea expert at the Fletcher School of Law and Diplomacy at Tufts University, said, “Trump and Pence will come across more and more as grumpy old men as Kim Jong-un continues to sharpen his knife and his sister flashes that mysterious smile.”
South Korean media scrutinized every detail, including style of dress and handwriting, of Ms. Kim, the first immediate member of the Kim family to set foot in the South. During a government briefing in Seoul on Monday, a reporter asked whether Ms. Kim was pregnant, saying she appeared to have a slight baby bump.
In South Korean media, Ms. Kim was nicknamed “Princess” or “North Korea’s Ivanka” because of her influence with her brother. She was often compared to Ivanka Trump.
Ms. Kim’s trip to South Korea was her debut on the global stage.
But back at home, she appears careful not to step into the spotlight as part of a government whose monolithic power structure requires all propaganda to be focused on her brother. In North Korean television footage, she is often seen keeping to the background and darting away to avoid the camera while Mr. Kim presides over a state ceremony or visits factories.
Even as she was being welcomed home at the Pyongyang airport on Sunday, she stayed a step behind, letting Kim Yong-nam, the North’s nominal head of state and the chief delegate to the South, inspect the honor guard.
But her trip put Ms. Kim very much closer to center stage.
“The high-level delegation’s visit to the South has become a significant turning point in improving North-South relations and laying the groundwork for peace on the Korean Peninsula,” a newscaster on the North’s state-run Korean Central Television service gushed on Monday, reporting on Ms. Kim’s return home.
For his part, Mr. Moon, the South Korean leader, responded with caution to Ms. Kim’s overtures. He is a strong advocate of dialogue with North Korea but faced doubts that another summit meeting with North Korea would help end its nuclear weapons program.
“Although the first step toward a peaceful resolution of Korean Peninsula issues has been laid, discrepancies in the positions regarding the North Korean nuclear issue still remain and there is currently no visible progress in denuclearization of the Korean Peninsula,” his government said Monday in a statement.
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