Rebirth: Top Actress, Your Big Shot Husband is Jealous Again! - Chapter 11 Whose Chest Is Bigger?

Liana, a humble omega raised in silence, awakens on her 18th birthday with the scent of her fated mate — the son of the Alpha. But the bond isn't simple. The Alpha has triplet sons, and all three begin to feel the pull toward her. Thrust into the center of political tension and pack rivalry, Liana must confront betrayal, ancient magic, and a forgotten prophecy.As she finds herself entangled with Kael, the stoic firstborn, Jace, the charming troublemaker, and Rowan, the cursed empath, Liana discovers she is more than she was told. Her wolf is the reincarnation of a Luna lost to betrayal. Her bloodline is royal, hidden in shadow. And her destiny is not to choose a mate but to unite a broken world.With Celeste, the Beta's daughter, unraveling in jealousy and Darius, a rogue Alpha with vengeance in his heart, threatening war, Liana must rise. Not as an omega. Not as a mate. But as the Luna fated to reshape the future.

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

Luis, a poor 17-year-old boy, tries his luck at becoming an Awakener to change his fate. However, his dreams are shattered when he fails to awaken a Special Spirit and is instead saddled with a 5 million dollar debt by their planet's colonizers, the Flying Star Empire.His life seemed doomed—until a mysterious system suddenly appeared in his head: The Monster Transformation System. It gave him the power to transform into any monster or animal he had ever seen.From a cat to an eagle, even a horse, Luis begins to understand that his power may not come from Spirit... but from the ability to become any monster.

When I read the development of the heroine getting stolen away, I left a malicious comment to the author.

But then I woke up later, and I’m now the villain who is supposed to steal the heroine.