Lee Sangyeon (이상연) is the leader of K-pop group THE BOYZ under IST Entertainment. He was born on November 4, 1996 in Seoul, South Korea, making him the eldest of the group. He debuted as a lead vocalist in THE BOYZ but has since been promoted to main vocalist, showing off his vocal ability in tracks such as “THRILL RIDE” and “MAVERICK.”

Following THE BOYZ’s main rapper Sunwoo, Sangyeon also released singles for THE BOYZ’s SoundCloud account, debuting with “DAY OFF” in December 2020. He followed up with “돌아갈래,” a special Children’s Day single featuring the three youngest members of THE BOYZ, staying true to his position as the leader and “father” of the group. In 2018, he participated in King of Masked Singer to gain recognition while showcasing his vocals. In April 2021, he participated in a vocal unit for Kingdom : Legendary War alongside THE BOYZ member New and vocalists from other competitor groups.