Seol Chae-woo is a top vocal talent at his university with a promising future seemingly his for the taking; until his life comes crashing down before his eyes. When his mother suddenly passes and his father’s business goes bankrupt, Chae-woo is now forced to work odd jobs to keep his crumbling family afloat. But when his uncle approaches him with the idea of becoming a Reset Partner - one who carries an alpha’s child for him in exchange for hefty compensation - Chae-woo has a choice to make. The only problem? The alpha in question is Chae-woo’s rival - the enigmatic dominant alpha Beom Euigeon. Will the two be able to put their differences aside and create beautiful music together, or will this low note in Chae-woo’s life become an indefinite song of sorrow?