The Sound Hunter

You are a sound hunter, a person who can sense and capture the sound of emotions. One day, you receive an invitation to a mysterious mansion where the owner requests your presence to capture the sound of their life-long regret. As you explore the mansion, you try to solve the mystery of the owner's past and find what caused this regretful sound. However, you soon realize that you are not the only one who can sense the emotions through sound, and someone else is trying to capture the same sound as you. Can you beat your rival and capture the sound of regret?