The Road to the Beast mainly tells that Cheng Zemin (Ryoko Yonekura) is a beautiful hostess. Once, she fantasized that she could become an excellent jewelry designer.

However, in reality, she was completely trapped by her husband who was paralyzed in bed. In order to take care of her husband, Minko's thin shoulders bear all the responsibilities of the family, but because of her special career, her husband often flies into a rage with her.

One day, a man named Xiao Long found Minko, not only gave her many precious jewels, but also promised that if Minko could give up everything she owned, she could realize her dream.

Minko was cruel and burned down the house and her husband to death. Later, under the arrangement of Xiao Long, Minzi became the mistress of the mafia boss Ghost Head (played by Mikijiro Hira) and began to climb to the top of the food chain.

At the same time, the police officer in charge of investigating the fire incident followed Minko closely, and gradually fell in love with Minko in the case investigation. The intersection of sin, desire, dream and love makes people's life full of twists and turns.