Nunde-Gagri is a mostly defensive martial art that focuses on incapacitating your opponent with a minimum expenditure of your own energy. The primary focus lies on both punches and grapples and it often relies on the stamina and agility of both the attacker and defender.
The biggest strength of Nunde-Gagri is having the exploitable knowledge of where the weak points are in the body. By exploiting the shifts in balance of both fighters your opponent can become overconfident and leave an opening, giving you the perfect opportunities to retaliate.
On the other hand the biggest weakness of Nunde-Gagri is the illegal moves in this art are easily used and exploited by others. When your opponent doesn’t fight with the same rules you could quickly end up overpowered.