The Wei family has a son and a daughter
His elder brother Wei Xun is good at fighting and drag racing. In the eyes of his parents, teachers and relatives, he is a standard rebellious boy.
My younger sister Wei Xing is good at studying, exams and competitions. In the eyes of her parents, teachers and relatives, she is a standard good student and good girl.
Wei Xun's close friends all know that he is extremely disgusted with his sister's smiling and obedient look.
Wei Xun: "... My sister? Tsk, whoever wants it can take it."
Wei Xing's best friends also know what a standard good student looks like in front of others: he curses clearly and coherently without using any curse words, he only hits those who deserve to be hit in a fight and cries for his father and mother when he fights, and he is the number one figure in the East District when he skateboards like Thief Six.
Wei Xing: "... My brother? Tsk, too weak."
***
Until he discovered his sister's true identity...
Wei Xing: "Wei Xun, let me introduce you, this is my boyfriend."
Wei Xun: "... Heh, are you worthy of being my sister's boyfriend?"
***
Main brother and sister getting along
[Dislike each other in the early stage + Brother dotes on his sister and protects his sister in the later stage]
[cp is not my brother]
[The emotional descriptions between the respective CPs are only a small part]
Purpose: Responsibility and maintenance between siblings