Instagram/Lee Young Ji Music Warner Music partners with MAINSTREAM to launch Lee Young Ji's new single "Robot," expanding K-pop's global reach. March 13, 2026 AceShowbiz - Warner Music has announced a strategic partnership with MAINSTREAM, the agency managing prominent South Korean artists Lee Young Ji and Kik5o. This collaboration marks a step in Warner Music Group's efforts to deepen its involvement in the Korean music scene and extend the global reach of its artists.