Ray is so naive that it hurts me. Like author tried to make him "cute elder brother" type ...

Ray is so naive that it hurts me. Like author tried to make him "cute elder brother" type but the story is not suitable for that excessive naiveness. Throughout the story he never thought about why his sister was actually suffering , how he could trigger it etc. He did not even think about his emperor responsibilities or if his sister wanted the throne. Even in this life , he had to hear directly from his sister that she wants to be empress that he finally figured it out. And instead of having a proper talk, he put a stupid act.
Basically it bothers me that every chrachter has some sad background and development throughout the story, but he stayed same naive stupid brother.