North Korean leader Kim Jong Un on Wednesday made his second public speech, signaling a departure in leadership style from his late father, CNN reportss. Speaking to tens of thousands of children in Pyongyang on the 66th anniversary of the Korean Children’s Union, Kim said the country has a good future. “Korea’s future depends on you,” he said. “The Korea you are in charge of will be a country full of laughter and happiness, and also the strongest country in the world.”Kim said the country has the latest rocket technology and called on the children to study hard, saying they cannot contribute to the nation if their grades are bad.In April, North Korea carried out a failed rocket launch that it said was to put a satellite into orbit. Other countries, including South Korea and the United States, assumed it was a coverup for testing its ballistic missile technology. About 20,000 children were transported to Pyongyang from around the country for the occasion , state-run KCNA reported.