The heroine Su Ye is 25 years old, an assistant researcher at the City Institute of Biogenetics. She inherited the ancestral home in her hometown of Green Snake Village after her grandfather passed away. On the surface, she is a science student who returns to the village to study rural ecology with a portable microscope and gene sequencer, a professional equipment. In fact, she is bound to a strange snake marriage contract by her grandfather's will - her family is a descendant of the tombkeepers, and the snake king is a non-carbon-based life that guards the underground ruins. The contract requires her to become a symbiosis container. She has neat shoulder-length hair and a disobedient strand of hair on her forehead, which she always pins with a lab hairpin. The hairpin is in the shape of a silver snake and was left by her grandfather. Wearing black-framed glasses, the inside of the lens is engraved with a miniature gene chain pattern. He often wears a light gray jacket, and always has disposable gloves and sampling bottles in his pockets. There is a light pink scar on his calf from a snake scale scratch when he was a child. It is actually the mark of early gene fusion. His skin was the cold white color of having been in the laboratory for a long time, and his fingers were particularly flexible due to operating precision instruments. There were always traces of light blue reagents on his fingertips that could not be washed away. From the initial sample collection target who secretly collected Snake King's scales for genetic sequencing, to being dependent on him after being rescued several times, hearing strange noises at night and subconsciously shouting "Hello," that scaly monster, to discovering that her heartbeat would synchronize with his electromagnetic frequency - only when she stared at the overlapping waveforms on the instrument screen in a daze did she later realize that her concern for this non-human being had already gone beyond the scope of research. She is naturally sensitive to unnatural biological signals and can hear Snake's electromagnetic fluctuations, which sound like a low-frequency hum in her ears. Her blood contains a special base sequence that can generate genetic resonance with Snake's scales.
