Shinji Matou at Your Service - Chapter 17 -

This is a ‘rebirth’ story where Chen Rong, the heroine, finds her second chance at life after burning herself to death. Set in the Eastern Jin era when bureaucrats and their lofty yet equally hypocritical and oppressive ideas once ruled the empire, Chen Rong is made to use her past life’s experience to survive and hopefully find happiness this time around.

- Description from Novelupdates

Ella has the most perfect life. A life that everyone could envy her. She has a beautiful face, a beautiful body, abundant wealth.

The most important thing to her is that she has her someone that she thinks is her soul mate.

But a betrayal makes herperfect life shattered. She was lied to, toyed with and thrown into a much worse place than hell.

She was expelled from her family and locked up in a mental hospital, a place that shatter both of her wings.

Five years later, Ella returns with one goal in life. She handed over her body to Christian, a CEO who is notorious for being the cruelest.

In exchange, Christian will help him achieve his dream: REVENGE!

In a world fractured by conflict and haunted by shadows of the past, Kokushibo—the first Upper Moon demon—meets his end, only to awaken in a new life. Reincarnated as Crimson, a child born into a different family, he carries the memories of a past he cannot escape. Burdened by centuries of guilt yet indifferent to the present, he resigns himself to duty—until an unexpected bond with his newfound family begins to thaw his hardened heart. As he struggles between the weight of his past and the weight of the new life, Crimson must decide whether he will remain shackled to his former sins or embrace the possibility of peace.

Once she crossed through, she actually became the disfavored third WangFei?