Quietly

They met when she was two years old. One promise kept her by her little brother's side for over twenty years, but somewhere along the way, feelings she shouldn't have developed began to take root... Then one day, she discovered that her brother wasn't related to her by blood. Her usually gentle and refined little brother's eyes turned red, and he stopped calling her "big sister"...

Theme: After youth has passed, the bonds of family become love in the heart.