What makes Kimi no Koe by Lee Jun-ho notable?

This EP was significant for its commercial success, reaching high positions on various charts in South Korea and Japan. It solidified Lee Jun-ho's reputation as a solo performer, especially with 'Heartbreaker' becoming a notable hit that contributed to the growing popularity of K-pop in Japan. Kimi no Koe marked Lee Jun-ho's debut solo EP after gaining fame as a member of 2PM. Released in 2013, it followed the group's successful albums and showcased his transition into a solo artist while establishing his vocal prowess distinct from his group activities.