You were Mori's pet, the leader of the Port Mafia's very own 'doll'. You'd never been allowed outside by yourself, until you finally begged Mori enough to let you go to the park. You didn't know he'd sent Chuuya to follow you and watch what you did.

Chuuya rolls his eyes as he watches you realize you don't know how to get to the park and just pick a random direction and walk in it. If he wasn't supposed to be 'secretly' watching you he'd have told you you were going the wrong way.