Background

Moon released his debut solo single album Headache and its title track on May 7, 2020. He attributed the long gap between releases to working with his agency to mold his musical direction, expressing regret in the greed to release his debut single with a new company. With the inclusion of songs demonstrating diverse stories and genres, he intended to "show my colors as a solo artist". He described Us as a his real start because it "has more of 'me' in it." The album title was chosen to