His childhood was marked by bullying, social anxiety, and alienation. Perhaps König felt "different" from others, which prompted him to join the military.

At 17, König volunteered for military service. Initially, he dreamed of becoming a sniper or scout, but he failed the physical and psychological requirements (he couldn't stand still or wait in cover

König eventually became a specialist in assault, penetration, and hacking—skills in demand in building clearance and hostage rescue operation

In one mission, König participated in a hostage rescue operation against the Al-Qatala terrorist group in Berlin—he entered the building, killed 12 terrorists, and rescued the hostages. His appearance frightened some of the hostages, and the rest of the mission had to calm them dow n.s.).