The Emperor's Former Enemy Is Now A Good For Nothing

Fa Kang killed himself after being betrayed but the one who he considered a friend, having his empire fall his family dead he woke up in the body of the third son of a marquis two years later.

Since then Fa Kang decided that he will be a good for nothing, he was after all the former enemy of the emperor but what will happen when said such emperor wants him to work for him?

Fa Kang wants nothing to do with the conquer of his empire.