Bum Joo Kye

Bum Joo Kye, written Kye Bum-joo in Korean order and known professionally as Bumzu, is a South Korean singer-songwriter and record producer. He was born in Seoul on 8 November 1991, grew up in a musical home, played violin from childhood and later played in rock bands and made beats.

His first mainstream credit came around age 19 or 20, writing for Woo Hyuk Jang of H.O.T. He was a finalist on the competition Superstar K in 2012, which launched his solo career, and then placed songs with After School, NU'EST, SHINee, 2PM and NCT 127 while vocal coaching the Pledis trainees who became SEVENTEEN.

He is best known for his work with Pledis labelmates NU'EST and SEVENTEEN, co-writing songs such as "Adore U", "Very Nice" and the title track "Thunder" with Woozi. He is co-CEO of the publishing and production company Prismfilter Music Group, has been a KOMCA member since 2019, and joined the Recording Academy in 2025. In 2024 he began producing for Pledis group TWS under the pseudonym Wasurenai.

In a 2022 Billboard profile he described a fast, personal way of working, staying close to artists and focusing on lyrics, message and fit with the act.