FACT"Hyugeo" (휴거) is a portmanteau combining "Huimaeshia" (희망캐슬, a former LH public-housing brand name) with "geoji" (거지, beggar) — a slur aimed at children living in public rental housing. "Elsa" (엘사) is a separate pun combining the "LH" public housing agency's initials with the Disney character's name, used the same way.
FACTKorean media has reported cases since roughly 2015 of these terms spreading among elementary schoolers, including reported incidents of parents from market-rate apartment complexes instructing their children not to play with kids from neighboring rental-housing blocks, and at least one reported case of a parent demanding their child be moved away from a public-housing classmate, threatening to transfer schools if the request wasn't granted.
FACTLH (Korea Land and Housing Corporation) began phasing out its "Huimaeshia" brand starting in 2014, rebranding new public housing developments as "Millennium Tree" (천년나무) — a change reported as being made partly in response to the stigma that had attached to the old brand name itself.