Super 꾸이꾸이 🐹

In the Korean comments

One comment flags a second-watch detail, reading in translation: “The two looked exactly alike as cute guinea pigs, so I didn’t notice they switched roles in the middle of the dance.”

What the words mean

기니 자매 (gini jamae, “guinea sisters”) is not presented as a claim that Rei and Wonhee are related. Here it is a playful, affectionate pairing name based on comparing the two performers to similarly cute guinea pigs.