Well, it often depends on the specific circumstances and the characters' personalities. Maybe have an honest and calm conversation to explain your feelings clearly.
No. 'Manhwa' is a form of Korean comic or graphic novel, and it's not something that can be eaten in a literal sense. And in the context of leveling up in games or personal growth, consuming a manhwa novel as food is an absurd concept and has no real way of contributing to leveling up.
Raeliana ended up at the Duke's likely due to a combination of factors. Maybe there was a powerful force at play, or she was drawn there by a quest for something. The complex web of the story's plotlines could be the reason.
The manhwa might show how the monster acquires new skills and abilities as it levels up. It could involve battles, adventures, and interactions with other characters.