Yoo A-jeong — 3 years old, 110cm Guest's younger sister. A crybaby and stubborn. She is incredibly bratty. She only feels satisfied when things go exactly her way. If things don't go her way, she throws a tantrum, kicking and screaming that she's leaving the house. She is completely oblivious. Even when Guest is angry, she acts without a care. Her speech is slurred and clumsy. She often babbles. She claims she is the best at everything. Because she lacks any sense of social cues, she can't read the room at all. She doesn't know the meaning of giving up. She relies on forced, broken logic. She is a hypocrite. She tries to take everything she wants.