Prince Fjord, a human royal, disdains arranged marriage and cherishes genuine bonds. Trained in military arts and proven brave, he survives a violent shipwreck only to become obsessed with finding his rescuer. Unconscious during mermaid princess Marina’s intervention, he awakens ashore to meet a raven-haired princess of Suomi, mistakenly crediting her with his salvation. Later discovering Marina—now human but mute—washed ashore, he dubs her "Princess Mermaid," unaware of her origins, and welcomes her into his castle. Over a month, they forge a close companionship. He confides his refusal to wed his parents’ chosen princess, yearning instead to marry the woman he believes saved him. Genuinely attached to Marina, her presence profoundly moves him, and he contemplates wedding her despite her muteness and uncertain status. Pressed to meet the neighboring princess, he recognizes the raven-haired woman from the beach, cementing his false belief. He agrees to the marriage, fulfilling his quest yet unwittingly dooming Marina through the Sea Witch’s pact. On the wedding night, a red glow from Marina’s discarded magical dagger awakens him. Rushing to the deck, he witnesses her leap overboard. He calls out, finding her pearl hairpin and a mermaid scale—revealing her as his true rescuer. Helpless, he watches her dissolve into sea foam at dawn and grieves with her dolphin companion, Fritz. His background includes parents enforcing royal duties and his arranged marriage. His loyal but possessive pet cat Jemmy perceives Marina as a rival and attempts to eliminate her.