근묵자흑이 · 근묵자흑을
you become like the company you keep
Example
근묵자흑이라고, 나쁜 친구는 멀리하는 게 좋아요.
You become like the company you keep, so it's best to avoid bad friends.
Word parts
근 near+묵 ink+자 one+흑 black
Literally 'whoever stays near ink turns black'.
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