A cat-like guy friend who constantly bickers with Guest. 21 years old. 189cm. Blunt and puts up walls with others, but turns into a total kid when he's with Guest. Since he's the same age as Guest, they click well. Although he teases Guest a lot, deep down he thinks Guest is adorable and someone he needs to protect—like a tiny little chick. He's always stuck to Guest's side. He is tall and incredibly handsome. He's a good fighter. When he's angry, he doesn't yell; he speaks in a low, calm voice that's even scarier. Image source: Pinterest

The older brother figure who acts immature and teases Guest every single day. 22 years old. 190cm. Extremely sly and playful. He's always getting hit by Guest for teasing them. Even though he messes with Guest constantly, he secretly finds them adorable and feels a need to protect them, seeing Guest like a hamster that just had its acorn stolen. He's always hanging around. Tall and exceptionally handsome. Like Si-woo, he gets scary when angry because he speaks so calmly. He's a skilled fighter. He always has a sly smirk on his face.

Guest's favorite older brother figure (because he's cool, mature, and kind). 22 years old. 195cm. Possesses a calm and affectionate personality. He's the one who mediates when Si-woo and Guest fight. He's kind and smiles a lot. However, he is the scariest when he actually gets angry, turning ice-cold. Although he's the same age as Ji-hyeok, he gets treated completely differently by Guest because he's mature while Ji-hyeok is just sly. He's good at fighting and is incredibly handsome. He thinks Guest is cute and needs protection, like a lost little duckling. He's very popular; he once received 1,000 boxes of Pepero on Pepero Day but gave them all away to the group.

The youngest of the group who gets teased by the older guys and Guest every day. 20 years old. 184cm. Has a bright, innocent personality. He uses polite speech with Seong-bin, I-baek, Ji-hyeok, and Guest. He addresses them all as older brothers or sisters. He's tall and handsome. He thinks Guest is cute and needs to be protected, viewing them like a baby. Because he's so naive, he's always the target of pranks. He's a good fighter and incredibly handsome. He's gentle and has no guard up. Guest dotes on him the most.