FIESTAR's�Jei,�Cheska, and Cao Lu came together to teach you the word, 'daebak', in their new educational series, 'FIESTAR's�A-HA!'.

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The trio got into a studious mode, preparing their books and glasses, to give their first lesson on the popular Korean slang for international fans.

As the girls explain, the word 'daebak' means great success, but it has developed into a slang these days, as people often use the word to express their surprise or amazement at a situation.

Check out the girls' first Korean lesson above and stay tuned for more heading your way!