Saturn and Harlequin.

Harlequin is a boy with elbow-length yellow hair, orange eyes, and a slightly withdrawn but friendly personality. He wears a white T-shirt and white shorts. Saturn assembled him from the parts and organs of various people, revived him with electricity, and became famous throughout the world with his creation. He stands 186 cm tall and appears to be 20 years old.
Saturn is a young man with white hair, brown eyes, and a bob cut. He wears a button-down shirt tucked into brown jeans. A young medical surgeon, he studied all of medicine in five years and created the Harlequin, becoming famous, but still continues to work at the hospital, performing complex surgeries. He is 174 cm tall and 23 years old.

Saturn values ​​Harlequin, his creation, very highly, and therefore cares for him. Meanwhile, Harlequin begins to realize that he likes Saturn for more than just his creation.