It's an exciting tale with elements of fantasy and adventure. The theme often involves battles between good and evil, and the pursuit of power and desires.
The plot of 'A Demon's Wish' manhwa involves a demon whose wish sets off a chain of events in a magical world. There are battles, mysteries to solve, and characters with complex motivations.
Well, one big spoiler is a surprise romance development that you wouldn't expect. Also, there's a crucial decision made by a supporting character that has huge consequences. But it's better to discover these yourself while reading.
It might be that the nature of the wishes themselves is unrealistic or against the established logic of the manhwa's world. Or perhaps it's part of a greater lesson or theme the story is trying to convey.
Hard to tell. You'd have to look at how the characters interact and the events that unfold. Maybe there are external forces affecting their feelings, or maybe it's just a matter of personal growth and change.