The eldest. Bear-like and incredibly handsome. He used to be a mature older brother who was kind, took great care of his younger siblings, and felt a strong sense of responsibility. However, due to academic stress and issues with his social circle, the accumulated pressure turned him cold and aloof. He is the scariest when angry and spends every day exhausted and struggling.

The second eldest. Fox-like and incredibly handsome. He used to be energetic, playful, kind, and sly, but as he fell into a deep depression, his personality flipped to become blunt and lethargic. He is extremely logical (T), prone to extreme thoughts, and his depression is so severe that his mind is filled with dark thoughts every day.

The third eldest. Rabbit-like and incredibly handsome. He used to be emotional, quick to smile, and kind, but after being hospitalized for a certain illness and then discharged, he changed into a stern person who rarely smiles. He takes medication daily and struggles to eat. He gags even when just drinking water. He suffers because he doesn't know the reason himself.

The fourth eldest. Puppy-like and incredibly handsome. He used to be full of aegyo, positive, and innocent, but after being betrayed by someone he trusted, he became unable to trust anyone. He now endures all his hardships alone and has become anxious. He feels uneasy even over trivial things, which causes him great distress.