Definitely not. 'The Wish Man' is purely fictional. It might draw inspiration from various sources, but it doesn't have its roots in actual events or people.
On the road of life, everyone will experience all kinds of setbacks and difficulties, but as long as we have a firm belief and face the difficulties, we will definitely succeed. 30 was an important milestone in a man's life. It meant that he had the ability to think independently and make decisions. He had his own career and hobbies, and he also knew how to get along with his family and friends. At this age, he should work harder and focus on exercising his body and improving his self-cultivation to lay a solid foundation for his future life and career.
Well, typically, such a manga could have the man dealing with deep emotional turmoil that leads to his death wish. Maybe there's a tragic backstory or a series of events that push him to this extreme. The story might also focus on how he interacts with others who either understand or try to change his mindset.
They bring hope. For example, a terminally ill child who wishes to go to Disneyland gets to experience that magic. It gives them something to look forward to during their difficult times in the hospital.
I'm not sure. It's hard to say if Wish is realistic fiction without knowing more about the story. But usually, if it portrays a world and scenarios that could conceivably happen in real life, it has a chance of being so.