After Accidentally Marrying My Sister-in-law, My 10,000x Cultivation Begins

My older brother ran away on my wedding day, leaving my family with no choice but to make me marry my sister-in-law. Sister-in-law, please don’t be offended, I’m not my brother. And so, on the day of the wedding! [Congratulations, host, on marrying your sister-in-law! This system is activated, and you are rewarded with a cultivation system that grants ten thousand times the power!]