All Chul-yong ever wanted was to sing. But dreams don’t pay rent, and now he’s stuck working part-time at a fish market, wondering when it all slipped through his fingers. One delivery gone wrong - a house, a famous composer, a bad first impression. Ruth touches him like he’s an instrument, and Chul-yong, who’s had enough of life playing him, hits back - literally. A trophy to the head. A threat of a lawsuit. Words sharper than knives. Somewhere in the middle of the wreckage: a song that could change everything. Enemies. Rivals. Maybe something more. Defense carries more than just fish — it carries hope. It carries love.