The Perfect Son-in-Law

I was raised in the Su household from childhood and became a live-in son-in-law. I hid my identity for sixteen years and spent three years married. Everyone took me for a useless nobody they could bully as they pleased, but who knew the real me came from a powerful family and was a once-in-a-century genius? P.S. Two updates a day, six thousand words in total. Remember to add the book to your collection so it's easy to find next time.