Answer:
The Strange case is about good side of someone and his dark impulses.
Step-by-step explanation:
Dr Jekyll is a respected researcher but has a very dark impulses he is afflicted with. Each time, his dark impulsestries to push him to commit crime eventhough it is not what he really wanted.
He had no option than to develop a drug that allowed him to transform into Mr Hyde- the ugly monster with those dark impulses. At the beginning, he was happy and comfortable with the transformation. But as time goes on, he begin to notice that even without the drug, he is changing to Mr Hyde- which is against his will.
He tried everything possible to stop it even to the extent of running out of ingredients to prepare his drugs. He ended up killing himself just to put an end to it.