To be honest, I don't know for sure. Sometimes it might be feasible, but it often depends on the rights and regulations associated with that particular manhwa. You might want to look into the terms and conditions provided when you got it.
Well, usually it's possible, but it might involve certain conditions. For example, if it's a subscription-based service and you haven't violated any terms, you might be able to. But if it's a one-time purchase or has specific usage rules, it could be more complicated.
It depends on the specific context and plot of the manga. Sometimes characters can take back actions or decisions, but it's not always straightforward.
It depends on the specific terms and conditions set by the source or platform where you accessed it. Sometimes, you might have the option to re-read it, but not necessarily take it back in a literal sense.