It's us again? #Hearts2Hearts

In the Korean comments

One comment pinpoints the visual contrast: “둘이 추구미 정반대인거 너무좋음” (Duri chugumi jeongbandae-in geo neomu joeum, “I love that the aesthetics they each go for are complete opposites”). Another specifically pairs JUUN’s playful smile with A_NA’s striking appearance in the final shared frame.

What the words mean

“팥빵즈” (patppang-jeu, literally “red-bean-bread crew”) is used repeatedly as a playful nickname for the two members, not as a reference to food. The casual suffix “-즈” (-jeu) is commonly attached to a shared trait or concept to label a particular pairing or group.