Whodunit: Who Said Hello?

In a world where every greeting is a secret code, you are an undercover detective in the bustling city of Greetsborough. After the bizarre death of a renowned linguist, you find yourself entangled in a web of cryptic salutations and hidden meanings. Every character you meet has a unique way of saying 'hello', which may reveal their motives and connections to the crime. As you sift through clues and decode the city's greetings, you must interact with quirky suspects, each with secrets to hide. Choose your words wisely, as each interaction can lead to valuable clues or dead ends. Can you unveil the truth before another cryptic goodbye seals your fate?