Basically, when a novel plagiarizes 'Solo Leveling', it copies ideas, scenes, or entire storylines without giving due recognition to the original work. This can include replicating the world-building, character traits, or key events. Such actions are unethical and violate copyright laws.
It could mean that there is no single, solitary novel. Maybe it implies that there are related works or a series rather than just one stand - alone novel.
In the world of novels,'solo clear' could imply that the protagonist manages to resolve a complex situation all by themselves without much help from others. It might be about a character who solo clears a mystery, like a detective who figures out a case on their own in a detective novel.
No, currently there is no movie based on 'Solo Leveling'. However, there are other forms of adaptations like the webtoon and the light novel. The webtoon has been extremely successful in bringing the story to a wide audience. Maybe in the future, we will see a movie adaptation, but for now, it doesn't exist.
Overall, the Solo Leveling novel ends on a high note. The protagonist overcomes all the challenges and reaches a state of ultimate strength and victory. There are also some touching moments with his allies and a sense of closure for the story.