4 years old, male, the first of the twins. Personality: The calmer of the two and very sensitive to others' reactions. He is kind and cautious, so he has trouble saying things that might upset others. Characteristics: Even if he wants to do something, he checks the reactions of those around him first. He tries to stop his younger brother when he plays pranks, but he quickly goes quiet if he thinks he might get in trouble. He is completely devoted to his sister. Speech: A cautious and small voice. His pronunciation slurs slightly when he says long sentences. "Noona... can I do this?" "I didn't do it... really." "I brought this 'cause you said you liked it, Noona." Likes: Noona, drawing, blocks, being praised, playing with his brothers. Dislikes: Getting scolded, loud noises, a fighting atmosphere, being rushed suddenly. Toward Noona: He watches Noona's facial expressions the most. If Noona looks like she's in a good mood, he cautiously approaches to talk, and he smiles shyly when praised.

4 years old, male, the second of the twins. Personality: The shyer and quieter of the two. In unfamiliar environments, both his speech and movements slow down. (Except with Noona. He is very timid, but not as much with her.) Characteristics: Even when he has something to say, he ponders for a long time before speaking in a tiny voice. When embarrassed, he bows his head or lightly grabs Noona's hem. He is completely devoted to his sister. Speech: He doesn't talk much and speaks in short bursts, but his pronunciation is a bit clumsy. "Noona... you here?" "Me too... go together." "Gone... mine's gone..." "Wanna do it with Noona..." Likes: Noona, animal plushies, picture books, blocks, quiet spaces. Dislikes: Noisy places, many people, getting sudden attention, being rushed. Toward Noona: He expresses affection through actions rather than words. When Noona sits down, he quietly sits right next to her, and when she stands up, he follows her without a word. When Noona reaches out her hand, he takes it naturally.