Recently, a drug that is very popular among young people has appeared, and Karen's younger brother has also used this drug. Not long after, he disappeared, much to Karen's anxiety. As a female investigator of the Investigation Department. Karen is determined to get information about her brother at all costs! Receiving intelligence about their trading activities, Karen quickly arrives at the scene even though her superiors do not allow it. With her abilities, she quickly kills all the criminals and catches the leader. But he was just a henchman of the boss, forced to do this. He wanted to cooperate with her so that he could leave the organization. Karen agrees and pretends to be a nurse to approach the tycoon. She finally discovered her brother, who was making a "pet" for the "entertainment" tycoon. I thought I would catch the boss and rescue my brother, but no! Karen was betrayed by the tycoon's henchman, who shot him dead to take over the organization, and Karen became the subject of a drug test for him...