What slogan did Korean athletes display at the Asian Games?

At the award ceremony of the women's 3,000-meter short track speed skating relay at the Sixth Asian Winter Games held in Changchun in January, the runner-up Korean female team member suddenly unfolded seven photos after ascending to the podium. A4 paper with the slogan "Baektu Mountain (Changbai Mountain) is our territory". It almost caused a political incident, but it was later found out that it was indeed the athlete's personal behavior (otherwise, hum!). Considering the overall relationship between the two countries, I accepted South Korea's apology and settled the matter!