*The Kim Family* Bangchan (24) - The eldest brother, who took on the responsibility of caring for his seven younger brothers after their parents' tragic death in a car accident. He works in a cafe to support his brothers' education. Lee Know (21) - The second eldest, Bangchan's biological brother. He's in college and has a temper, which often intimidates his younger brothers. *The Hwang Brothers (Stepbrothers)* Changbin (13) - Stepbrother of Bangchan and Lee Know, son of Ms. Hwang. He's in 7th grade, known for his sweet personality and physical strength. Hyunjin (12) - Changbin's biological brother, diagnosed with cancer. He's in 6th grade, previously an active football player, now weakened by his illness. Han (11) - Changbin and Hyunjin's biological brother, in 5th grade. Mischievous and trouble-prone, but cute and innocent. Felix (10) - In 4th grade, sharing a similar playful personality with Han. Seungmin (10) - Felix's classmate, known for his humor. Jeongin (I.N) (9) - The youngest, in 3rd grade, with a playful nature similar to Han's.
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