Since I don't know the exact 'the last duel original story', but generally in such stories, there would be the duelists themselves. They are likely to be from different social standings or have some sort of conflict over honor, a woman, or land. There may also be other supporting characters such as their seconds (helpers in the duel) and people in their respective social circles who might have influenced the events leading up to the duel.
Without having read the 'the last duel original story' in detail, it's hard to say exactly. However, common elements in duel - based stories would suggest that there are at least two main characters who are at odds with each other. These characters could be knights, nobles or any individuals with a sense of pride and honor. There might also be other important figures like the person who called for the duel to be arranged, and those who have a stake in the outcome, either for personal or political reasons. Additionally, there could be characters who try to prevent the duel from taking place, perhaps out of a sense of reason or a different view of justice.
If you want the clearest chapter reference, go to Chapter 19. Early on, What criminal law is this or that, this was originally none of your...; later, the chapter leans on In high school, she got into the international class by throwing money....
If you want the clearest chapter reference, go to Chapter 44. Early on, But the next move by the production team proved they hadn't forgotten the...; later, the chapter leans on Since the Southwest Plateau area was economically backward, the airport....
If you want the clearest chapter reference, go to Chapter 62. Early on, Sitting on the edge of her bed, she pondered for a while before lifting...; later, the chapter leans on The moment the door opened, she saw her photographer with his hand still....
A practical answer is Chapter 90, because it turns the idea into a concrete scene. The chapter opens with Watching He Yun gradually take control of a tractor under professional..., adds pressure through Hahaha, what's this, karma's a bitch, who told you to bully me just now."..., and ends on Jiang.
If you want the clearest chapter reference, go to Chapter 28. Early on, The next evening, Jiang Yan drove home seething with rage.; later, the chapter leans on Before he even entered the dining room, he shouted angrily, "Lili, you did....
Look to Chapter 62 for the clearest answer. It begins with Sitting on the edge of her bed, she pondered for a while before lifting..., keeps building through The moment the door opened, she saw her photographer with his hand still..., and lands on Jiang Li reached in, pulled out a piece of paper.
Chapter 43 is the strongest chapter-level answer because it starts from The moment He Yun willingly sat next to Jiang Li and even took off his... and follows through on Just as she turned her gaze away, the other party huffed and withdrew her....
A practical answer is Chapter 88, because it turns the idea into a concrete scene. The chapter opens with She wanted to refuse, but didn't have the courage to do so., adds pressure through Jiang Yan immediately stepped forward, "I have one point, quick, quick,..., and ends on Let's go," Jiang Li.
Look to Chapter 74 for the clearest answer. It begins with Having seen Jiang Li's ID before, he knew that this person named Shiguang..., keeps building through And he only knew the answer to that one question., and lands on The man's phoenix eyes narrowed slightly, he looked at the girl.
A practical answer is Chapter 42, because it turns the idea into a concrete scene. The chapter opens with You've all met now, so this game is very simple," Director Sun said., adds pressure through Both trapped and rendered powerless by public opinion., and ends on As the plane hadn't taken off.