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'Goodbye'

안녕히계세요 vs 안녕히가세요

안녕히계세요 = said by

the person leaving the room / situation

안녕히가세요 = said by the person saying bye to the person who is leaving (direct translation 'go ahead')

example:
customer: 안녕히계세요
shop assistant: 안녕히가세요

is this right ?