Sunghyuk (성혁)

Among the vocalists who passed through the short-lived RAINZ — the project group assembled from *Produce 101 Season 2* eliminees in 2017 — Seo Sung Hyuk, performing as Sunghyuk, held the maknae position alongside a vocalist role before the unit concluded its activity. He has since continued as a lead vocalist with TAN.

The available record on Sunghyuk's discography, chart performance, and broader career arc is not sufficient to support additional sections under K-Pop!t editorial standards. This profile will be updated as further sourced material becomes available.