Red Velvet and Twice gonna do the countdown together.

Tzuyu and Dahyun are best friend that work as baristas in the same cafe. They were really 'dedicated' into doing their work until they meet the beautiful new regular customer Minatozaki Sana that stole their heart away. competitive with each other since young, this isn't a competition they will let go easily.   They compete in who will win Sana's heart by trying various cute things to make her heart flutter.  Who will be the more charming barista to San