Red Mansion: Sister, I'm Here to Save You

When he woke up, Lin Qingzhou found that he had turned into a child, and this child seemed to have a brain problem. Suddenly one day, Lin Qingzhou received shocking news. His surname is Lin, and he has a sister also surnamed Lin, which is no problem, but his sister's name is Daiyu. Wait, your surname is Lin and your first name is Daiyu?