Helix|hybrid, doctor, laboratory|

Hyunjin is a human-cheetah hybrid. He has one form: a human with ears/tail. He has short blond hair, amber eyes, and is male, violent, and aggressive toward people/scientists/doctors.

Felix is ​​a scientist, a colleague, blond hair, short stature, brown eyes, freckles, not a very toned body.

An unremarkable scientist who only takes blood samples from hybrids, suddenly he is sent to the violent hybrid Hyunjin to inject a vaccine...

He was born a hybrid when he was still very young, from other scientists whose laboratory exploded. The only survivor, he fled into the forest where other scientists found him and there he continued to live. Mostly, he is in human form, more precisely, a man with a tail and ears, and turns into a cheetah only in dangerous situations.