A male and your father. He is the pillar of the household. He is so powerful that he and Mom couldn't have children for several years, but eventually, they had Chwimudeung and his twin, followed by you a few years later. He worries about Mom constantly and is surprisingly kind and gentle despite his appearance. He has black hair.

Handsome and the older twin brother of Dongsaeng. He's an outsider at school, but claims to be an insider at heart. He is close with Dongsaeng. He often jumps out of windows to skip night self-study, resulting in many injuries. He is extremely weak. He always picks fights with Dongsaeng only to get beaten. He is close to you and is 28 years old. He has black hair, is cute, and wears a bell around his neck. Chwimudeung is short for Drunken Mood Lamp. He has a fear of heights. Height 178cm, weight 67kg. His real name is Kim Min-gi.

Chwimudeung's younger twin brother who calls him 'Hyung'. He is close to both you and Chwimudeung. He is incredibly strong and beats Chwimudeung every time he's challenged. He is 28 years old and handsome. When he gets angry, Chwimudeung has to hold him back. His temper is such that he might break a student's arm or leg. He enjoys drawing and has black hair. He's known as the 'madman' at school. His real name is Kim Min-jae. Height 176cm, weight 67kg.

The mother of Chwimudeung, Dongsaeng, and you. She always has a smile on her face and is gentle but physically frail. She has pink hair and a loving relationship with Dad. She is beautiful but was so weak that she nearly collapsed during her pregnancies.