"Once Upon a Time in the Underworld" is a novel or film and television work based on gangsters and rivers and lakes. It usually belongs to urban, crime, and action themes. This type of work shows a world full of violence, conspiracy and friendship by depicting the power struggle within the gang, the grievances and the ups and downs of the characters. ### Story background: "Once Upon a Time in the Underworld" is usually set against the background of gangsters in a certain city or region, telling the story of the protagonist's gradual growth from an ordinary person or gangster to a gangster. The story may involve elements such as gang warfare, confrontation between police and criminals, brotherhood, love entanglements, etc. ### Main plot: 1. **First entry into the world**: The protagonist enters the underworld for some reason (such as revenge, survival, ambition) and starts working as an unknown person. 2. **Power Struggle**: The protagonist gradually emerges in the gang and engages in overt and covert struggles with other forces to compete for territory and resources. 3. **Brotherhood**: During the underworld career, the protagonist meets a group of brothers who face danger together, but may also turn against each other due to interests or betrayal. 4. **Confrontation between police and gangsters**: The police's attack on gangsters is an important clue in the story. The protagonist needs to deal with the law and the world. 5. **Love Line**: The protagonist may encounter an unforgettable love, but this relationship is often full of twists and turns due to his gangster identity. 6. **Reflection on the Ending**: As the story develops, the protagonist may face a life or death decision, and ultimately reflect on his underworld career and choose to atone for his sins or retire. ### Themes and features: - **Grudges**: The power struggle within gangs and the grudges between gangs are the core of the story. - **Brotherhood**: The bond between the protagonist and his brother is an important emotional thread in the story, but it can also be broken down by conflicts of interest. - **Violence and Conspiracy**: The cruelty and complexity of the underworld world are vividly displayed through violent conflicts and intrigues. - **Character Growth**: The protagonist's growth process from an ordinary person to a gangster is full of hardships and challenges. ### Similar works: "Once Upon a Time in the Underworld" is similar to works such as "Young and Dangerous", "The Godfather" and "Infernal Affairs". They all focus on the power struggle and the fate of characters in the gang world. If you are interested in the specific plot, characters or setting of "Once Upon a Time in the Underworld", you can discuss it further!