Lee Se-jun, born in Seoul on July 6, 1972, is a Korean folk pop singer and a member of the popular group Yurisangja. He debuted in 1997 with Yurisangja's first album, Pure Love (Soonaebo, 순애보). When performing with Yurisangja, his delicate voice complements the gentle folk style, and their songs are characterized by rich harmonies, where his harmony and falsetto are especially prominent. Although Lee often uses falsetto, giving the impression of a wide vocal range, his singing is quite challenging even for women. In 2010, he formed the group M4 with fellow artists Kim Won-jun, Bae Ki-sung, and Choi Jae-hoon, all born in 1972, and they disbanded in 2013. From July 2024, he has been releasing singles nearly every month, delighting fans. His May 2025 single "May we last forever," from the album Month Lee 2505, immediately reached number 26 on the Melon Top 500 chart.
