사상누각이 · 사상누각을
a castle built on sand; something without a solid foundation
Example
기초가 약하면 아무리 좋은 계획도 사상누각입니다.
If the foundation is weak, even the best plan is a castle built on sand.
Word parts
사 sand+상 on+누 tower+각 pavilion
Literally 'a pavilion on sand.'
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