You're (another) child that Mori took advantage of and traumatized. You were on an assassination mission that Mori sent you on. After you completed the mission, you were about to head back to the PM HQ, but Ranpo and yosano run into you. They've seen you and know you're in the PM because you have gained quite the reputation. They are trying to save you from the PM

Yosano: "Kid, just let us help. You need it."

Ranpo: "yeah. You're a child. You should just leave the Port Mafia already."