In City F, the famous Typhoon Police Department has a criminal investigation team called the "Lightning Criminal Investigation Team" that has repeatedly solved strange cases. Under the leadership of captain Jian Yuan, seven people have achieved great results together. But these seven people have their own concerns and hide each other. Are they really friends? Who among them will be an undercover agent?
The criminal group XFIVE from two years ago reunited and repeatedly opposed the police department. Who are they? Why are there big changes in the police department?
Concept: The relationship between brothers can even exceed life. Behind every case, there is unspeakable sadness.