It's Not Bad to Have a Brother

One is a "problem student" who gives teachers a headache and is a "bad boy" in everyone's eyes; One is a "genius" and a "good girl" in everyone's eyes, The two seemingly unrelated and hugely different people are actually twins! Under the agreement of "not letting others know that we are brother and sister", －－－－－－－－－－－－－－－－－－－ [Please collect it~~~Thank you~~~]