모습 is a native Korean (고유어) word combining 모 (shape, form) and 습 (appearance, manner) — the same 습 seen in 습관 (habit) via Sino-Korean blending. The compound evolved to mean the overall visible form or figure of a person or thing.

모습 is extremely versatile in Korean and appears in both heartfelt and everyday contexts. It is frequently used in K-dramas and song lyrics to express admiration or longing — e.g., 보고 싶은 모습 (the appearance I miss). It's also common in formal speech, such as 멋진 모습을 보여 주세요 (Please show us a great performance/side of yourself), used to encourage someone before a big event.