In 'Whose Hello?', you play as Sam, a down-on-their-luck private investigator in a quirky city where everyone greets each other with a unique 'hello' that signifies their personality. One day, you receive a mysterious letter that simply says 'hello' from someone claiming they know your lost cat, Mr. Fluffington. To solve this bizarre mystery, you must navigate through the city's eccentric neighborhoods, interrogating colorful characters, and uncovering their unique greetings. As you interact with residents, you'll piece together clues while following a thrilling and comedic storyline that keeps you guessing until the end.