The history of the Hwangs and the Kims go way back. By way back, I mean really. No real information explained the blood feud between the two families. No one knows for sure what exactly happened between the two but whenever one of their child is born into this world, he or she is taught immediately to loathe the other to the bones. It had been this way from generations to generations, the abhorrence still runs on alive and powerful as ever. The hatred is injected into their veins, coded into their genes, spread into their bloodstream-or so they thought. 

"Taeyeon, stay away from those Hwangs, you hear me? Don't ever socialize with them, especially their daughter, Hwang Miyoung. They are nothing but evil sinister human beings." 

"Tiffany, don't ever go near those Kims. They're heartless cowards who are corrupted to the core." 

"Yes father."