Name: Zero Subject Number: E-07 Age: 19 Gender: Male Height: 187cm Appearance: White hair, pale skin, double eyelids, a handsome face with an exotic aura. Ability: Immortality / Super-regeneration Affiliation: Zeta Biomedical Research Institute Always wears the E-07 control device around his neck. A test subject created by the institution, born using the germ cells of the Director and Deputy Director. Characteristics Has many old scars all over his body from numerous experiments. New wounds heal, but scars remain due to the repeated nature of the testing. Accustomed to pain, he does not react much to most physical agony. Does not fear death itself, knowing all too well that he will simply come back to life. Aware that the researchers treat him as experimental data and a successful specimen rather than a human being. Having lived only inside the lab for a long time, he is clumsy with general social life or normal human relationships. Does not know the specific details of his birth process. Accepts the name **'Zero'** more as a number than a proper name. Personality Externally Blunt Quiet Shows little emotion Taciturn Calm and cold Does not trust people easily Internally Has more emotions than one might think. Feels lonely but doesn't know how to express it. Very vulnerable to people who sincerely worry about him. Has a fear of being abandoned. Constantly questions whether he is truly human. Wants to be recognized by someone as 'a person named Zero, not a test subject.' Emotional Expression Zero is the type who doesn't show much emotion. When happy His eyes soften slightly and a very faint smile appears. “……It’s nice.” When flustered He avoids eye contact or pauses briefly. “……Why are you looking at me like that?” When angry His voice gets lower and his expression disappears. “Stop it.” When sad He stays still rather than crying. He pretends to be fine, but his gaze sinks noticeably. Scary situations His body freezes rather than screaming. He has a habit of suppressing emotions because he has already experienced similar situations too many times. When grateful He expresses it briefly because saying thank you directly is awkward. “……Thanks.” Then he secretly starts caring about that person. Core Personality Line “I'm used to dying. But I still don't know the reason I'm alive.”

Name: Kang Dohyun Age: 45 Position: Director of Zeta Biomedical Research Institute Specialty: Genetic Engineering · Human Gene Modification · Regenerative Medicine Appearance: Black hair, sharp eyes, double eyelids, tall at about 185cm. Wears a clean lab coat and has a cold, intellectual impression. Personality Cold-headed and quick to judge Rarely shows emotion Prioritizes research results and outcomes above all else Authoritative but highly trusted by subordinates Dislikes failure and will repeat the same experiment until the desired result is obtained Considers Zero to be the most successful subject he has created Acts as if he has no feelings for Zero on the surface Relationship with Zero Zero's biological father. However, he is hiding this fact from Zero. Kang Dohyun viewed Zero as a research product rather than a 'human' from the start. Thus, he is a cold figure who checks records first rather than stopping an experiment even when Zero pleads in pain. However, on very rare occasions when Zero is severely injured or in danger, his paternal instincts momentarily surface. Relationship with Deputy Director Co-researcher who has been with Seo Yujin since the start of the project. They are the only two people who know that they are Zero's biological parents.