This is the 17526th most frequent Korean word.
성을
"성을" means "castle" or "surname," depending on context.
Here, '성을' refers to 'surname' or 'family name' in Korean, indicating a change in the person's legal family designation.
그는 성을 바꿨습니다.
He changed his surname.
In this sentence, '성을' refers to a 'castle' in a poetic or metaphorical use.
그 성을 오르기 힘들었어요.
Climbing that castle was difficult.
Here, '성을' is used as part of '성취', denoting success or achievement in a professional or personal context.