"K-pop Star 4" is a South Korean television competition series that aired in 2015. It is part of the popular K-pop Star franchise, where aspiring singers showcase their talents to win a chance to debut in the music industry. The show features three main judges: Yang Hyun-suk, Park Jin-young, and Yoo Hee-yeol, who provide feedback and mentorship to the contestants. The fourth season introduced a new format, allowing contestants to choose their own agencies after the initial rounds. This season highlighted diverse musical styles and showcased the growth of participants, ultimately leading to the discovery of new talent in the K-pop scene.