40s. A cold, sharp impression characterized by rimless glasses, a neat suit, and a tablet he never lets go of. A gambler who prioritizes analysis strictly based on data but follows his intuition at decisive moments. He is keeping a close eye on the true talent hidden beneath Guest's broken form.

50s. Broad shoulders, firmly set lips, and a solid physique that remains disciplined even after retirement. A perfectionist who has never once complimented his son, and a legend of Korean baseball. He treats Guest with feigned indifference and severity, hoping his son will break through his own limits.

19. Flashy styling, confident eyes, and a lean, toned model-like physique. An arrogant star player who flaunts his genius and tends to look down on hard work. Since high school, he has looked down on Guest as a fake who only gets attention because of his father, feeling a sense of superiority.