I Am the Nanny of the Villain - Chapter 8:

In a world ruled by strength and chaos, a soul from modern Earth awakens in the frail body of a seven-year-old Sakazuki. Orphaned by pirates and left with nothing but a burning hatred, he refuses to remain weak. With knowledge from his past life and the power of the Magma Magma Fruit, he begins his ruthless ascent through the ranks of the Marines.But justice is not so simple. Corruption festers within the very institution meant to uphold order, and the line between protector and tyrant blurs with every battle. Undeterred, Sakazuki will forge his own path—one paved with fire and blood.From a vengeful child to the most feared force in the Marines, witness the rise of a man who will set the seas ablaze and redefine what it means to bring order to a chaotic world.

For the large sum of money to help her husband, she chose to be a surrogate mother covertly. Her sweetheart was out of trouble, but she became the woman of loose morals in his eyes. Misunderstanding, disappointment and sadness forced her to divorce the man she loved from the childhood.

When she was determined to start new life, another man burst into her life. “You are my baby’s mommy and you are my wife!” A big surprise hit her that her baby’s Daddy, the man she surrogated for, fell in love with her at his first sight.

His deep love convinced her to believe the affection of love again. Unexpectedly, her ex-husband returned to beg her recombination. One was her childhood sweetheart, and the other was the man who loved her and gave her hope for a new life……Facing the two men, what is her choice?
 

- Description from Novelupdates

One sentence introduction: She reconciled with herself by virtue of her performance.

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When she was about to die, she “traveled” through the apocalypse, and after 30 years of hard work, she was finally reborn by tearing down the system, but was planted with the seeds of murderous manic depression. Since then, there has been an additional villain professional in the entertainment industry, with superb acting skills, and has repeatedly won the crown of the best actor.

Key words: women disguised as men, dramas in dramas, fanboys, Hanwen Copywriters

- Description from novelbuddy

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.