Mistaken as His Mate: The Luna’s Regret Ending Explained: Full Plot Summary & Episode Spoilers

Alpha Caspian travels directly to the landing strip to receive his sister Marina, who has returned home pregnant following the battlefield death of her mate, Alpha David. Knowing that carrying a pup prevents her from shifting and leaves her physically delicate, Caspian pledges to shelter her at the ancestral manor. Watching from behind airfield machinery, Willow's mother Ivy observes Caspian embracing his sister and kissing her baby bump, immediately assuming that the leader has impregnated a secret lover.

Ivy calls Willow to announce the supposed betrayal and provides photographs of the two together. Although Willow originally dismisses the claim as impossible on her coronation day, the pictures inflame her insecurity and prompt her to plan a strike against the newcomer.

Marina settles into her old bedroom while holding the Bloodveil Moonstone, a priceless family heirloom necklace she redeemed for three billion dollars to gift to Caspian's bride. When Caspian steps away to oversee pack duties, Willow and her attendants barge into the room, declaring Marina to be a despised mistress.

Marina attempts to explain her true identity as Caspian's sister, but her inability to shift into her distinct white wolf due to pregnancy leaves her unable to convince her captors. Willow drags Marina before the assembled dignitaries and coronation guests, smearing her as a home-wrecking rogue and rallying the attendees to despise her.

During the confrontation, the heirloom necklace falls to the floor, and Willow smashes the generational artifact to fragments under the assumption that it was bought for a rival. The physical brutality escalates when Willow halts her brother Rowen from delivering the blow because she insists on executing the punishment herself. Willow kicks Marina directly in the abdomen until blood flows, terminating the unborn pup.

Refusing to show remorse, Willow locks the weakened and bleeding Luna within a silver cage to suffer in seclusion. Caspian soon arrives back at the estate expecting to present his sister to the court, only to discover her missing and find evidence of an attack, sparking immense outrage across the gathering.

Caspian finds Marina caged and learns the devastating truth about his unborn nephew's murder. Confronting his bride, Caspian ignores her attempts to play the innocent victim and promises ruthless justice. Desperate to deflect retribution, the Hale family claims that Willow is pregnant with Caspian's future child, but Caspian demands a bloodline ritual to verify the paternity.

Fearing the wrath of the Alpha, Rowen turns on Willow and offers to divulge the true identity of her unborn child's father in exchange for their escape from the hall. Caspian permits them to exit the banquet unchallenged, honoring the letter of his promise while keeping a pack of starving rogue wolves stationed outside to track and destroy the entire family.