Seriously speaking, Pyongyang is a quite nice place to visit, although there are certain limitations of freedom of activities for travellers.
There is no Rugby in the DPR Korea. Most popular sports are Soccer and Boxing.
Taekwondo is a Korean-origin martial arts, and there are 2 codes in Taekwondo like Rugby.
There are ITF (International Taekwon-Do Federation) and WTF (World Taekwondo Federation). WTF is an Olympic sport while ITF is not.
In the ROK (Republic of Korea), both codes are practiced, but in the DPR Korea only ITF exists.
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And the danger of radioactivity is no joke. You should avoid eastern part of Japan, particularly areas close to Fukushima. You should not bring children, vulnerable to radioactivity.