Maybe it's because of the characters' incompatible personalities. Their differences might make it impossible for the marriage to work out.
The marriage in the manhwa might be doomed to fail because of a combination of things. Maybe there's a betrayal, or maybe they have fundamentally different life goals and values that just can't be reconciled.
Maybe it's because of a lack of communication and understanding between the characters.
Maybe there are irreconcilable differences between the couple, like constant arguments over money or family issues.
Maybe it's because of the constant conflicts and misunderstandings between the characters that seem impossible to resolve.
They can start by being honest with each other about their feelings.
Well, it could be due to a lack of communication. If they don't talk about their problems, the marriage might seem doomed. For example, if one person has certain expectations in the marriage like having children or moving to a different place, and they never discuss it with their partner, misunderstandings will pile up and lead to the failure of the marriage.
Maybe it's because of the constant conflicts and misunderstandings between the characters. Their inability to communicate effectively makes it seem like the marriage has no chance.
Maybe it's due to a lack of communication and understanding between the characters.
I'm not sure as I haven't read the novel specifically. But usually, in a novel about a marriage in trouble, the main characters would be the husband and the wife.
It depends on what you like. If you're into stories about troubled relationships, it might be. But if you prefer more positive or light - hearted stories, it may not be for you.
Since I haven't read the novel, I can't say for sure who the main characters are. But it's likely to be the husband and wife in the troubled marriage.