Whose Hellos Are These, Anyway?

In a sprawling metropolis where faceless strangers commute side by side, you find yourself receiving peculiar messages every day, each signed with a simple 'Hello!' and an enigmatic drawing. As you follow the trail of these quirky hellos, you unravel a web of interconnected lives, secrets, and absurdities. Engage with a colorful cast of characters, solve humorous yet dramatic scenarios, and discover the incorrect assumptions and hilarious truths behind the messages. Can you piece together the puzzling mystery and find the elusive sender before the hellos stop?