In a world where females are expected to be Omegas, Kaya Valen is the only female Alpha in her kingdom. Once a cherished daughter, she is disowned by her father after he discovers that she is an Alpha and brands her abnormal. Meanwhile, her younger sister Yuna, a beautiful and beloved Omega, remains in the castle, adored and pampered by everyone. Kaya turns to the battlefield, training to fight the beasts that threaten their kingdom. Her incredible strength and fiery red hair earn her the name “The Red knight.” When Zhen Kai, an Alpha King from a distant Chinese kingdom, loses his powers and becomes the target of assassins seeking his throne, he searches for a knight strong enough to protect him. Hearing of the legendary Red knight, he hires Kaya as his bodyguard. But what begins as a simple duty soon takes an unexpected turn.

Nicole, a wealthy CEO, marries a poor storekeeper and gives him half her fortune, only for him to murder her out of greed and stage her death as suicide. Given seven lives to seek revenge, Nicole repeatedly enters the lives of people connected to him, but her ruthless husband destroys everyone who stands in his way. Now, with only one life left, Nicole must finally defeat him or lose her chance at life forever.