My favorite thing about them is how comfortable they are with each other! You can really see Hanbin relax around Gyuvin when they are together, letting out his more playful side, while Gyuvin loves taking care of his hyung and never misses a chance to show off how well he knows him. At the same time Hanbin is someone Gyuvin looks up to a lot and that has been a reliable pillar for him, so him wanting to repay the favor by taking some of the burdens off his shoulders is extra sweet. Idk, there’s so much fondness and mutual admiration in their relationship, shipping goggles aside. I just really like their interactions, and I think there are maaany ways their dynamic can be explored in a romantic way.