We can't really force him to not have piercings of course the piercing is part of his life, even if it's a scar it like image of his past that he never forgotten that what makes him, him as for the present. Hori is just worried for miya and also we know that hori didn't know about miyamura's past it's just normal for girlfriends to be worried to their boyfriend. ╮( ̄▽ ̄)╭
Why is that I love this couple so much, like it's so adorable that ivan teases hen so much that makes him jealous in a cute way ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄