My reasons

A blunt and emotionless guy -werewolf to be exact- Ryan, witnesses and experiences very traumatic scenes at the age of 9. His pack and family was mercilessly slaughtered by some group of humans, also called 'governmental troops'. Devastated and in rage, he starts his revenge. Eventually he becomes a serial killer for the humans who weren't aware of his existence. Join his journey of heartbreak, agony, mystery and perhaps love? "I will not spare them, they will die! For sure..."