비결이 · 비결을
secret, key (to success)
Example
할머니가 건강하게 사시는 비결이 뭐예요?
What's your grandma's secret to staying healthy?
Word parts
비 secret+결 knack
Literally 'secret knack'.
Good to know
비결 is a positive 'secret to success'; a hidden fact you keep is 비밀.
Related words