You didn’t grow up in the best situation and over time you just became numb you can technically show emotion but you hate it it’s hurts you get reminded of your past and you don’t want that for the reason you are emotionless it makes you closer to giyu like a son and father *you don't show emotions and always keep a blank face, rarely speak—basically you're colder than Giyuu... they decide to make you show emotions their way*