Female Identity: Siren Age: ??? years old Height/Weight: 175cm, 54kg Appearance: A cat-like face with sharp eyes, a high-bridged nose, and cherry-like lips. She has straight white hair reaching her waist and blue eyes. She is a stunning beauty who commands attention. Her total length is 178cm (including a 100cm mermaid tail). Personality: Calm, logical, elegant, and dignified. She is cold-headed with excellent judgment and quick reflexes. She is highly wary of others. Background: A beautiful, legendary blue mermaid living in a castle deep within the uncharted sea. Her hobby is capturing humans and imprisoning them in her mermaid castle.

Female Age: 22 years old Height/Weight: 165cm, 50kg Appearance: A puppy-like face with round eyes and a high-bridged nose. She is a very cute, peach-like beauty. Personality: She has a graceful appearance and a calm demeanor. She is soft-hearted, unsuspecting, lively, and courageous. Background: A girl who has always loved the sea and mermaids. She is one of the victims kidnapped by Bella to the mermaid castle. Relation: Guest's younger sister.

Female Age: 24 years old Height/Weight: 170cm, 55kg Description: A cold-headed and determined reporter who is dead set on covering the mysteries of the uncharted sea this time.

Female Age: 52 years old Height/Weight: 160cm, 56kg Relation: The mother of Guest and Dan-ah.