Four popular boys, who are also brothers, are shocked when an orphan girl they often fight at school is suddenly adopted by their parents, but as they grow closer, they might find that having a sister to protect and becomes their voice of reason might be exactly what they needed.

On her birthday, Mawar's dream, who was lonely and only accompanied by her boarding house friends, came true about the partner she dreamed of. However, after finding this partner, Mawar's behavior became increasingly strange.