Kim Jong-un became North Korea's Supreme Leader on December 29, 2011.[26] He married Ri Sol-ju in either 2009 or 2010, and the couple reportedly had a daughter, Kim Ju-ae, in 2012.[13] His sister Kim Yo-jong had fallen out of favour with her brother for a few years but in 2017, she was elevated by Kim Jong-un to the powerful Central Committee of the Workers' Party of Korea. Kim Jong-un made an effort to distinguish himself from the reputations of his father and brothers, and has promoted the image of an academic who possesses a masculine and extroverted demeanor.[5]