Returning home in glory for college entrance examination admission 42

Due to a disaster, the siblings lost their parents and had to rely on each other for survival. After the college entrance examination, the two of them were admitted to the same university, but due to poverty at home, the older sister gave the only opportunity to attend university to her younger brother. My younger brother returned after completing his studies and was determined to repay his sister and the people who had helped him, and to slap the person who had bullied the siblings