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성실 (noun)
Sincerity, faithfulness, or diligence.
Think of 'S.O.S.' (Sincerity On Steady). To be 'Seong-sil,' you must be Sincere and Steady like a clock that never stops...
Using 성실 to mean 'just busy.' → Using 바쁘다 or 분주하다 for being busy.
Using 성실하다 for inanimate objects. → Using 튼튼하다 (strong) or 성능이 좋다 (good performance).
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