First, create strong and complex characters. For the male lead, give him the traits of a mafia figure like being powerful, mysterious, and having a sense of danger. The female lead can be someone who is independent or gets caught up in the mafia world unexpectedly. Then, build a vivid mafia world setting, including the hierarchy, the illegal activities, and the code of honor. Develop a plot full of conflict, like rival mafia groups or the heroine being in danger from the hero's world. And of course, add plenty of romantic tension between the two main characters.
Well, start by thinking about the kind of mafia story you want to tell. Is it a modern - day mafia in a big city or a historical mafia setting? Then, create your characters. The hero could be a mafia boss trying to go straight for the sake of the heroine. For the plot, think of things like the mafia being involved in a big heist and the heroine getting involved accidentally. In terms of the romance, build it slowly. Let the characters get to know each other's flaws and strengths. You can also add side characters like the hero's mafia family members who either support or oppose the relationship. Use dialogue to show the chemistry between the characters and make the story flow.