The Sinuiju Cosmetics Factory is known for its special "spring fragrance."
Kim Jong Un and his sister Kim Yo Jong crossed the border line on Friday morning to hold talks with South Korean President Moon Jae-in.
North Korean media will no longer use the "comrade" title for the leader's wife.
Little is known about the first member of Kim Jong Un's family to enter South Korea, but experts say rising star Kim Yo Jong is all part of the plan.
North Korea has never revealed Kim Jong Un to have any children, but NBA star Dennis Rodman said, "he's a good dad and has a beautiful family."
Ri recently appeared with Kim on a happy tour of a cosmetics factory in Pyongyang.
North Korea's Ri Sol Ju and the U.S.'s Melania Trump may not have a lot in common, but their husbands both appear willing to start a nuclear war.
South Korean intelligence services say he fathered a third child with his wife Ri Sol Ju in February.
The setting for the banquet, reportedly held on Sunday, was the same as the one held earlier this month.