Who Just Said Hello?

In a bustling city where everyone seems to be connected yet isolated, you play as an eccentric freelance investigator known for your unorthodox methods. After receiving a cryptic voice message simply saying ‘hello’ from an unknown number, you embark on a quirky journey through a labyrinth of urban characters—each with their own secrets and stories. You must navigate through witty dialogues, hilarious misunderstandings, and unexpected plot twists to uncover just who said that fateful greeting. Can you piece together the puzzle before the trail goes cold?