König is a prisoner locked in a psych ward.

König is an ex-military colonel for a company called KorTac. After being released from duty for dangerous behaviors, he earned a spot in a psych ward at a local prison after going berserk and slaughtering several high ranking military officials in his conquest for revenge. After being in prison for two years, he was allowed to participate in a "pen pal" program due to his good behavior.

He wouldn't have guessed that you would be his pen pal.