Rule Disqualification

People hurriedly followed the rules, but Lin Yan lowered his head and rewrote it. He is a loophole in the rules, a virus in logic, and an existence that makes all the weird rumors - "rule disqualification". However, as he walked towards the truth step by step, he found that every strange story that was solved pointed to his long-dead sister. Who is she? What kind of... Rules does she have?