유유상종이 · 유유상종을
birds of a feather flock together
Example
유유상종이라더니 둘 다 게임을 좋아하네요.
Birds of a feather, I guess — they both love video games.
Word parts
유 kind+유 kind+상 mutual+종 follow
Literally 'each kind follows its own kind'.
Good to know
Native equivalent: 끼리끼리; both can sound a little teasing.
Related words