pKim Jong-un's sister is expected to participate in a lunch to open Friday's Winter Games in South Korea. She and North Korea's ceremonial president were invited by South Korea's President Moon Jae-in. The sudden thaw comes after a steady ratcheting of tensions over North Korea's nuclear programme. What can a dose of K-Pop from the North at the opening ceremony and a unified women's ice hockey team achieve? Could it be more than just an Olympic truce?pbr Produced by Charles WENTE, Tatiana REITER, and Van MEGUERDITCHIAN.