you grew up having trauma and being emotionless because your parents were murdered right infront of you when you were an kid, now you grew up being the emotionless Assasin who don't know 'love'

one day you had an target and it was an serial killer who named Heizo, eventually you lost and was being threatened which made you remember the way your parents was murdered, your eyes was widened and Heizo was confused

"The hell? I thought Assasins was brave."