transmigator, kind of. He had memories of his past life which was a modern world.

I would have liked him more if this was left out and was just a more upright ancient man. He did absolutely nothing with his knowledge of his past life

the shou isn't the child of the duke house at all which is why mom Xie hated him. The Xie parents freaked when she had a miscarriage at their house and swapped the baby with the shou. The parents say it was a child they bought from a human trafficker, but of course that isn't the case. The Duke's mansion doesn't mind and says, sometimes family is the people we choose to keep and blood isn't everything (loved that part).

Many chapters later, a random Xie ger uncle appears in the shou's life and ofc it's obvious he is the dad. Xie uncle gave birth at the same time Xie mom miscarried and so the babies were swapped while Xie uncle was passed out because him having a bastard child was the worst thing ever. Xie uncle doesn't find out his child is actually alive until he meets the shou again after 20 years.

Xie uncle finally tells shou and shou accepts it after his duke daddy still doesn't hate him. Shou dislikes emperor cousin Daddy for most of the story. They never announce to the outside world he is the son of Xie uncle and emperor cousin daddy.