Oh! That's it! Yeah, he does wear glasses!

He usually wears glasses, but today he isn't!

So that's why his face felt a little bit off.

I knew it...

His unnatural behavior in the hideout

was clearly because he couldn't see very well.

On his way home, his mind must've been wandering here and there, all the while losing his temper.

"Why couldn't I clear this mission smoothly?" "Am I still that unskilled as an assassin?" "I train myself every day, so is this not even nearly enough?"