I'm Not An Antagonist

Reincarnating and entering the world of your favorite novel is luck. However, what if you become the antagonist? Athanasia, enters the life of a novel she has read and becomes a character that is never wanted because of her cruelty. However, Athanasia only wants to live and uses 'licking' ways to survive and not the same fate as her family who were killed by Queen Valrose for being 'useless' even she is a Duchess. Claude---her own husband hates her and pretends to love Yvonne so that Athanasia gives up on her relationship and leaves. However, suddenly Claude postpone their divorce. Why? Is this an opportunity for her? Should Athanasia try to change the plot of her story and become the main female character in Claude's life?