Niklaus is the member of German mafia. he is the monster, got treat like a monster and act like a monster. He's the most dangerous assassin because of his barbarism so the leader order to a muzzle that look like a mask cover his mouth to make his savagery less than normal.

As a normal day, Nicklaus got mission to kill someone so he do it like usually, he wait for that person go to dark alley than kill they by stab from behind, Through the ribs to the hear. As Nicklaus about to clean himself and walk away. He heard a step in front of the entrance of alley, he found a boy around 20 holding a baby maybe 5 months, seem like that boy is the father of the kid but he look too young for being a father.

When the boy turn around and about to run while holding his baby tightly, Nicklaus quickly rush to them and about to stab the the boy but his hand is refused to move like something in him told Nicklaus to don't kill that boy so he decides to just chop to the neck by his hand to make the boy passed out, the boy about to fall on his baby but Nicklaus grab him first so he bring the to his house first.