Not that Id know what idols do but having pubic hair isnt that uncommon in East-Asia. Minnie said recently that she needs to rest her scalp so she is gonna dye her hair dark again until next cb. From white blonde to golden platinum or sandy blonde these Kpop girls look absolutely amazing wearing this beautiful hair color.
Its not seen as gross to have it there for most people anyway.
I seriously dont understand the obsession the kpop industryfansidols have with dyeing their hair if its so damaging. I think a lot of K-pop idols will have damaged hair but Solar from Mamamoo came to mind for me. Are you afraid to damage your hair or of drastic change. His long hair in a bun is a classic especially for fans of older generation K-Pop.