Lee Won-seok was born on July 10, 1975, and grew up with a passion for music. He pursued higher education at Yonsei University, where his musical journey began to take shape. In 1995, he gained early recognition by participating in the MBC University Song Festival with the group Sound Shower, earning the silver prize for their performance of "In the Strangle". Lee made his official debut in the music industry in 1997 with his album Trust Me, which marked the beginning of his solo career. In 1998, he joined the group Sera as a vocalist, further establishing his presence in the industry. His career continued to evolve as he ventured into composing and songwriting. Notably, he composed the track "Shout Me" for Maya, showcasing his versatility as a creator. Between 2005 and 2007, he was a member of the group Brunch, contributing to their distinctive sound. Since 2007, Lee Won-seok has been an integral member of the band Daybreak, further solidifying his position in the South Korean music scene. Throughout his career, Lee has also been involved in various Original Soundtracks (OSTs) for dramas such as "Day by Day" for Romantic Doctor (2023) and "Keep holding on" for Good Partner (2024).