Neither of the so-called villains in this novel act did anything villainous. One is an illegitimate child whose mother was killed by her father, abused by the nanny, and neglected by her familly, the other is the brother of the lead who tries kills him to become the duke. In what kind of novel does the male lead act like a psycho, the female lead like a broken abuse victim, and the "villains" are just called villains as an excuse to get them killed?
The story doesn't need them to be "villains", it serves no purpose, except to latch on the popular "reincarnated as a villainess" trope.