FIESTAR is going to teach you useful Korean slang through LOEN's Official YouTube channel.The cute and funny girls of FIESTAR taught us the word 'Daebak' on their 1st lesson, Deuk-tem on 2nd, Tteokbap on 3rd, Jjal and Dawn'jjal on 4th, 'Doljikgu' on 5th, 'Anseup' on 6th, 'Menboong' on 7th, 'le-al' on 8th, and 'Dotne' on 9th. This time, they transformed as detectives to teach us the slang Korean word, 'Bolmae'. " />