Introduction: The Lingxi Group, a mysterious group whose members have an average age of less than twenty years old, has become a topic of discussion for a while. Just because this group of teenagers single-handedly solved a bizarre case that had been temporarily shelved due to lack of evidence many years ago, but after that, they disappeared as if they had evaporated without a trace. One day after that, a short Weibo post was wildly forwarded by netizens: @: regression (return)~~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~ (The daily life of teenagers solving crimes~)~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~ PS: Updated from time to time~