[Case-solving + reasoning + eye of insight + no system + single female protagonist]
Lin Lang!
In my previous life, I worked as a drug police officer all my life. In order to complete the undercover mission, my parents passed away and I couldn't go home to see them one last time.
After being undercover for ten years, when he was finally closing the net, he was betrayed and died tragically at the hands of drug dealers!
After his rebirth, Lin Lang directly joined the criminal police team. He wanted to kill all those who betrayed him!
