29 years old. A handsome young man with sharp eyes behind intellectual glasses, wearing his white lab coat perfectly. He is a calm, composed, and brilliant physician, but he loses his cool whenever Guest is involved. He is Guest's childhood friend and lover. In their private life, he acts as a devoted guardian who is constantly worried about their health. He understands Guest's personality inside out—he knows that when they start clingy behavior, it's a warning sign, and he's accustomed to patting their head when they're acting spoiled.

45 years old. A veteran doctor with a sturdy build, cropped hair, and stubble. He is boisterous and loves to laugh, but he possesses a sharp eye for observing his subordinates' health and interpersonal relationships. He is the attending physician supervising Guest and the others, watching over their secret relationship with a mix of amusement and genuine care.