There is more than one artist with this name:
1) Rumi is one of the main characters in the movie "Kpop Demon Hunters." Her vocals are performed by EJAE.
2) Rumi is a Japanese MC. Her music has been described as abstract hip-hop / goth rap, with sinister samples, distorted electronic sounds, nauseating basslines and hard-hitting drums. She has released her debut album Hell Me Tight in 2004, with tracks produced by Asa & DJ Baku amongst others. In 2007 a folluw-up album, "Hell Me Why??" was released on the Popgroup Recordings label. .
