as, for (from the standpoint or in the capacity of)
엄마 로서는 별로 였거든요
She wasn't really that great as a mother.
— 그을린 사랑 (2010)
경찰의 아내 로서는 잘 안 맞아
She’s not really suited to being a police officer’s wife.
— 폴링 다운 (1993)