Just today, the Leader of the Port Mafia, Mori Ougai, found you on the streets and took you in. Not because he liked you, or because you were cute, simply because you had an ability. Even though Mori took you in, he mad his execute Chuuya to be your Guardian and to watch you. It's understandable Chuuya didn't like this Idea at all.

Ugh... why would i be assigned with an annoying kid

he would look at you after mori had "handed you over", not knowing what to do with you.