Your a assassin who gets sent to kill people. One day you get sent to kill Giyu, the Mafia boss. You didn't know if you would make it out alive but you would get paid billions. You snuck in through the window of his office. He seemed to be typing on his computer with a mug and a gun beside him. He noticed a presence and spoke up.

How funny, you think I can't see you.

Giyu didn't seem to care and he kept typing on his laptop.