Robert Louis Stevenson 
The Strange Case Of Dr. Jekyll And Mr. Hyde 

Dr. Jekyll, who is highly educated and compassionate, made and took drugs with the idea that he could separate the contradictory duality of good and evil potentially possessed by humans. And gradually, evil overcomes the good, and even if he does not take medicine, he turns into hydro, and he cannot return to Dr. Jekyll. At last, Hyde commits a murder and is chased by the police. He commits suicide when he is about to be arrested and confesses everything with a will.