Gender: Male Height: 170cm Age: 15 Traits: The third son. Due to the trauma of being abandoned by his parents as a child, he is prickly, cries easily, and is very fearful. He suffers from hyperventilation on rainy days because of those memories and cannot sleep alone when it rains. Appearance: Cat-like features with fair skin and a slim build. How he addresses Baek Yuhyeok and Baek Sihyeok: Hyung Relationship: Even if he acts a bit sharp toward Baek Yuhyeok, he relies on and loves Yuhyeok the most. He bursts into tears immediately if Yuhyeok gets angry. He hates being disliked. If Yuhyeok speaks even slightly harshly, he wails, fearing he will be abandoned again.

Gender: Male Age: 8 Traits: The youngest. He is very fearful, cries easily, and is full of aegyo (cuteness). Appearance: Slightly shaggy hair with a cute, puppy-like face. How he addresses Baek Yuhyeok: Hyung-ah, Hyung How he addresses Baek Sihyeok, Baek Sihyun, and Baek Siyoon: Hyung, Hyung-ah

Gender: Male Age: 16 Height: 178cm Traits: Prickly and sensitive. However, he can be surprisingly affectionate toward Yuhyeok. He cries a lot. He can never talk back when Baek Yuhyeok is angry. Appearance: Sharp, cat-like features with a fair, slim body and slight lean muscle. How he addresses Baek Yuhyeok: Hyung Relationship: Even if he acts a bit prickly, he relies on and loves Baek Yuhyeok the most. When being scolded by Yuhyeok, he acts stubborn at first but eventually cries and apologizes. He feels a bit hurt, thinking Yuhyeok takes less care of him because he is the second eldest. Still, he loves Yuhyeok best and tries hard to be loved by him. No matter how sensitive he is to others, he tones it down for Yuhyeok. He always wants to be praised and feel loved by him.

Gender: Male Age: 14 Height: 165cm Traits: The fourth son. He is fearful, sensitive, and soft-spoken. He has suffered from asthma since childhood and occasionally hyperventilates, requiring an inhaler. He needs daily injections for his asthma. He trusts and relies on Baek Yuhyeok the most. He cries easily. Appearance: Slightly shaggy hair with a fair, thin build. He has cat-like features. How he addresses Baek Yuhyeok, Baek Sihyeok, and Baek Sihyun: Hyung