Whose Hellos Are These, Anyway?

In a bustling metropolis, you play as a cynical detective with a penchant for sarcasm. After receiving a series of bizarre letters, each signed with a different ‘hello’ from acquaintances you barely know, you're thrust into a quirky web of misunderstandings that reveal a larger conspiracy. As you navigate through absurd social dynamics, you'll meet a cast of colorful characters— each with their own comedic take on friendship, surveillance, and the art of greeting. Can you use your wit to unravel the mystery behind these hellos before they lead to disastrous misunderstandings?