A young woman's life changes when she falls for her soon-to-be stepbrother, unaware he's the Alpha of a werewolf pack. Bound by fate, they grapple with their forbidden romance amidst his duty to rebuild his clan.

After moving to Sunset Town with her mother, Katherine becomes entangled with a stranger named Sebastian, who is both her professor and soon-to-be stepbrother. Unbeknownst to Katherine, Sebastian is the Alpha of the Moonrise pack and bears the responsibility of rebuilding the tribe. Sebastian, in turn, discovers that as the leader of the werewolves, he shares a fated emotional bond with the ordinary human Katherine. Living under the same roof, the two initially repel each other but gradually fall in love. However, their step-sibling relationship forces them to suppress their inner desires. Ultimately, they overcome the numerous obstacles posed by their forbidden romance and become partners.