It could be that you faced an overwhelming enemy or a situation that made it impossible to continue as the Demon Lord. Or maybe you just wanted a simpler, more peaceful life.
This question involved the membership system of some novel websites. Different websites might have different rules. However, generally speaking, if you quit halfway through the membership, you might receive some punishment.
Some websites might have a rule stating that if you didn't use up all your membership privileges and left the club midway, a portion of your membership rights would be deducted. For example, some websites might require full payment for the discount during the membership period, or a portion of the discount would be deducted.
Some websites might impose a penalty if they didn't complete their membership tasks or didn't spend a certain amount of money during the membership period. For example, some websites may specify that if one did not complete the membership task or did not spend a certain amount of money during the membership period, they would not be able to continue to enjoy the membership rights such as free chapters, membership consultation services, etc.
Different websites may have different rules. For details, you need to check the membership system of the website. If you quit halfway through the membership, it is recommended to read the terms of the membership system carefully to understand the relevant punishment rules to avoid unnecessary losses.
I'm not sure about the exact plot as I haven't read it in detail. But generally, it might be about a hero who decides to stop fulfilling the role of a hero, perhaps due to some disillusionment or personal reasons.
There were novels where the main character was a demon king, but these novels were relatively niche and many people might not be familiar with them. In novels, the demon king was usually a character with powerful magic and wisdom. He sometimes rebelled against human rule and tried to become the master of the universe. This type of novel often has elements of fantasy and adventure, and the plot is very attractive. For example," Devil's Day " was a novel about a demon king. It told the story of a demon king with magical wisdom and powerful magic power, Li Lingxiao, who experienced all kinds of difficulties and obstacles in the process of resisting human rule and finally won.
In the novel, there were many reasons why the demon king could avoid being killed by the brave only after becoming a demon god and transcending the world.
Becoming a Demon God would grant the Demon King great power and immortality so that he could avoid being killed by the Hero. In addition, becoming a Demon God would also allow the Demon King to have the ability and wisdom to surpass humans, allowing him to better control the world and order.
The Demon King might also hope to get rid of his pain and guilt by becoming a Demon God. He might have thought that he was originally a kind human, but he had suffered unfair treatment in the past, so he hoped to surpass the human class and status by becoming a demon god to obtain true freedom and equality.
Becoming a Demon God could also be a choice made by the Demon King to realize his ambitions and dreams. He may think that he has greater strength and wisdom to control the world and become a ruler.
In short, in the novel, the reason why the Demon King could escape the fate of being killed by the hero only after becoming a Demon God and transcending the world could be due to various specific situations that needed to be decided according to the plot and character setting of the novel.
Since I haven't read the 'I Will Quit Being the Hero Novel', I can only guess. There would probably be the hero himself who wants to quit. There might also be some friends or comrades who try to persuade him to stay in his heroic role, or who are affected by his decision. And there could be some antagonists who either oppose him because he's a hero or who take advantage of his decision to quit.