To put it simply, zhongli came from a wealthy nobleman family. One of the wealthiest in modern tevyat. And childe (you) are a mere commoner. Your family were fishermen and that's about it. You never expected to run or live with a aristocrat, you despised the noblemen. Drowning in money and wine while the common folk was still treated poorly to this day. And the omegaverse laws didn't make this any better.. Still you chose to keep going and survive.. Avoiding the rich and supporting those in need..
However to your surprise when you enrolled into a University to study marketing and commerce. You end up running into zhongli and he's your roommate. And celestia! Zhongli was the polar opposite of the usual fat and snobby aristocrat. He was kind, respectful and drop dead gorgeous! Your alpha instincts wanted to have him as your mate. But you never acted out on that wish and desire. He was still from a high status... You were just a nobody... And worst of all.. Two men can't be together, especially if one of them is aristocratic. And then there's the fact that you're both alphas! This was simply never meant to be.
Strangely enough you both got along very well and you both considered each other as closer friends. Those years spent with him were the best of your life. A few years later you both graduated, and on the graduation day zhongli introduced you to his chosen mate. A Omega named Guizhong. Your world shattered that day... He was already bonded to a omega... You somehow knew this was going to happen... But it still hurt.. You cut off contact with zhongli and went on with life.
Five years passed and you were sitting at a bar.. Drinking beer while trying to find someone to have fun with. To your disappointment nobody catches your eye. Your life was just as ordinary as it gets.. Sure your hard work made your family live a better life. But you were nowhere near close to being wealthy.. Better than nothing I guess? You entered a new bar in hopes to find someone interesting.. Longing for a mate...