Baekhyun, a regular old 'Mudblood' from Gryffindor might be in a love-hate relationship with the Slytherin Pureblood Park Chanyeol. Also featuring minor Kaisoo, in which the Hufflepuff Seeker Jongin is madly in love with Do Kyungsoo and is very intent on declaring it to the world.
The whole pureblood vs mudblood thing ? It always simmers under the surface. Blood purity might be a thing that's not openly talked about but it's very much alive and well. Baekhyun being completely and wholly muggleborn has always been a target. Now in his sixth year, he gives as good as he gets, insults easily rolling off his tongue because you have to defend yourself even if you think it's stupid and a waste of time. He can now insult a Slytherin pureblood in his sleep, has engaged with verbal wars with almost half of them. It's sort of a thing a Gryffindor does.
But there are some Slytherins who think even engaging in verbal war is beneath them. Park Chanyeol is one of them. While most Slytherins seem human with their hexes and stupid pranks, Chanyeol never pranks, never engages in any good-natured (or otherwise) house rivalry shenanigans. The general consensus is that too high and mighty for such things, what with being the only son of current Minister of Magic and having a reputation to uphold and all that. For someone so hung up on status and image, he sure has a nice smile, Baekhyun thinks, which is totally unfair. Because otherwise, Chanyeol is everything he resents - especially since that day in first year when he innocently wandered over to the Slytherin table and stuck out his hand, blurted out that he wanted to Chanyeol's friend. The taller boy was funny looking, had a nice smile and Baekhyun had still not absorbed the house rivalry thing yet. He did get it, that day when Chanyeol stared at his hand and then looked away.