I'm a Hereditary Commandery Marquis. What's Wrong with Taking a Bride?

Gu Chengning transmigrates into the Great Liang Dynasty.

His father, Gu Mao, died saving the emperor, and his mother, Zhao Ying, perished saving the empress.

With an upbringing like that, he could lie flat for the rest of his life.

But from the start, his fiancee wants to break off their engagement and marry someone else.

How could he put up with that?

So he simply steals the bride of his fiancee's younger brother...