A married man manga 1 might have a story centered around the man's attempts to balance work and family, or it could deal with his encounters with temptation and how he handles them. It's hard to say exactly without reading it, but it's likely to explore themes related to marriage and adulthood.
Well, one big difference could be the focus on marital issues and the challenges a married man faces. This might set it apart from other manga that deal with different themes like adventure or fantasy.
No, it's not ethical. Marriage is based on commitment and fidelity. When a married person has sex with another married person, they are betraying the trust of their respective spouses. It can cause a great deal of pain and damage to multiple families.
Dating a married man is a bad idea. You may think it's a romantic situation at first, but it quickly turns into a nightmare. His loyalties will always be divided between you and his family. You'll constantly be in a state of insecurity, wondering if he'll choose you or his wife. It can also lead to a cycle of lies and deceit. In addition, the emotional toll on you will be high as you'll be involved in a relationship that has no clear future and is built on the foundation of breaking someone else's trust.