North Korean leader Kim Jong-un has attended a ceremony marking the country's promulgation of its Socialist Constitution more than half a century ago, the North's state media reported Sunday. A national flag-raising and oath-taking ceremony was held at the Mansudae Assembly Hall the previous day to mark Constitution Day, with Kim in attendance, the Korean Central News Agency (KCNA) said. North Korea observes Dec. 27 as Constitutional Day in commemoration of the promulgation of its constitution on the same day in 1972. Kim made a commemorative oath marking Constitution Day, followed by participants who vowed to "dedicate themselves ... by always remaining faithful to promoting the people's well-being and the growth and development of the state," the KCNA said. Kim also commended labor innovators and meritorious persons invited to the event, for helping make this year "one of a great turn to be specially recorded in the history of the development" of North Korea. "The country is prospering and our cause is dynamically advancing without a moment's stagnation, thanks to the well-known and uns