North Korean leader Kim Jong Un left Pyongyang for his summit with South Korean President Moon Jae-in on Friday, where he will 'open-heartedly' discuss issues of peace, prosperity and reunification, North Korean state news agency KCNA said. 'Kim Jong Un will open-heartedly discuss with Moon Jae In all the issues arising in improving inter-Korean relations and achieving peace, prosperity and reunification of the Korean peninsula,' KCNA said.