Potholes are always on the street. The workers have been repairing it all day long, which nonetheless seems in vain. The road is still unstable. Is it due to the poor technique or other secrets? BrokenRoad is a song conveying conspiracies and secrets untold hidden in the city streets which are always under maintenance. Interestingly, the song connects 3 people, Da Vinci, Michelangelo, and Donatello, with the conspiracy. An uncanny air fill in the whole song. As a work to continue the song, Underbelly is created. Underbelly as an animal body party means the most fragile. It could be regarded as a weakness and further interpreted as the unknown dark side in a society. Sewer is the setting of the story, where 3 species as well, mouses, flies, and frogs, construct a hierarchical society and disclose dark conspiracies in a society.