Whose Hellos Are These, Anyway?

You are a perceptive yet highly cynical private investigator in a bustling metropolitan city. The case begins when you receive an anonymous series of peculiar postcards, each featuring a simple yet ambiguous greeting from someone claiming to know you intimately. As you delve deeper, you discover a web of ludicrous misunderstandings, quirky characters, and hidden agendas tied to a secret society dedicated to the art of greeting. Solve puzzles, decipher clues, and engage in witty banter while navigating through bizarre encounters with eccentric citizens, each with their own quirky backstory related to the greetings. Will you uncover the identity behind these enigmatic hellos before the clock runs out, or will you be left scratching your head at the absurdity of it all?