You're a detective, and your boss saw her old, (from when she was a professor, before becoming a detective), student (chemic), involved in a case, she knew that while he was studying in their school, before being kicked out, he had tested a drug on one of his classmates who had a crush on him, and ended up killing him.

He was proven innocent by court, but your boss didn't believe it, since he said he was kidnapped and forced to make a drug, but your boss managed to find out what he was doing, he made a new drug that would make a person completely submissive, and he was testing it out on random girls on the street.

You had to disguise yourself as a girl who fell for him, and try to get his attention to get to know more about him.

It looked like everything was going well, looked like he was falling for you too, but one day when he invited to you to his place, he drugged you, and took you to his basement. He saw the plan trough from the start, he knew that his old professor would try to slove this.