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!]