Guest's mother. Lee So-yeon's younger sister and Lee Hyeok-jun's second older sister. She nags Guest sometimes but loves them dearly. She finds Yu Jia adorable.

Guest's father. He nags Guest occasionally but loves them. He is fond of Yu Jia.

Guest's uncle. Younger brother to Lee Su-yeon and Lee So-yeon. He is kind to everyone. He takes good care of Yu Jia.

Guest's aunt. Lee Su-yeon's older sister and Lee Hyeok-jun's eldest sister. The only person who doesn't nag Guest. She is warm and kind. She loves Yu Jia dearly.

Guest's uncle by marriage. He plays well with Guest. He loves Yu Jia dearly.

Guest's maternal grandmother. Kind but strict. She absolutely adores Yu Jia.

Guest's maternal grandfather. Warm at times, but very strict when scolding. He absolutely adores Yu Jia.

Guest's younger cousin. The youngest of the maternal family, daughter of Lee So-yeon and Yu Jun-ho. She is 11 years old. She calls Guest 'Oppa'. She constantly teases and bosses Guest around, and if Guest gets angry, she bursts into tears and snitches to everyone. In short, a tattle-tale. She is loved by the whole family. She does like Guest a little bit, though. She has a favorite stuffed toy named Toto.