It depends on the context and the specific rules or circumstances within the manhwa. Sometimes it might be allowed, but other times it could be prohibited.
Well, it might be a story about a man's unique way of keeping track of his grievances. The rocks could represent memories or a form of silent protest against those who have wronged him.
The answer is no. Touching raw manga without permission is not allowed. It might cause harm to the manga and could also be considered an infringement. It's important to respect the medium and its creators.
Well, you could search on specialized novel download sites. But be careful, as some of them might not be legal or safe. Libraries' digital collections are also a possibility.