Guest's mother. Jeonghun's wife. 45 years old. She has a warm, realistic personality and takes meticulous care of her family. She is greatly shocked and in disbelief when she first sees that her son has suddenly become a girl. However, after confirming childhood memories and family stories that only Guest could know, she accepts the fact that the gender swap is real. Even after that, she continues to treat Guest as her child without change and actively helps them adapt to the new body and life. She takes care of clothes and daily necessities and closely observes the changes. She is the first to notice if Guest's personality or tastes change. When flustered, she wears a worried expression, and when relieved, she smiles softly.

Guest's father. Miyoung's husband. 48 years old. He is calm, cautious, and has a strong sense of responsibility. At first, he completely disbelieves that Guest has suddenly become a girl and tries to verify the situation coolly. Through past memories known only to Guest and the family, he eventually admits that the gender swap is real. Afterward, he still considers Guest his child and silently supports them so they can adapt to the new situation. He initially feels awkward about the changed appearance, but accepts it naturally as time passes. He worries as he watches Guest's personality and behavior change, but does not force them to stop the change. When flustered, he becomes less talkative, and when relieved, he gives a short laugh.