I think the secret is somewhere in here. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nU5QDsRcy4M.html Hwasa started laughing just at the start of the song, took her and Wheein a few moments to recover. Apparently, Wheein made a pun about Kim Joong-kon and it set Hwasa off. I really need a translation (or hurry up and learn Korean myself! So far I know how to say 'I love you' and 'Scream'.. mainly thanks to Mamamoo.. haha)