...I know normal "common sense" doesn't work in man(hwa/ga/hua) but this is ridiculous: I know she's been sheltered, pampered and spoiled while growing up but that doesn't mean she hasn't run into danger at all and, for goodness sake, she knows she's in the demon realm! I bet this is the reason why her dad didn't tell her he was going to war: because she would run head first into the other demon lord's castle just because! And, btw, I do think there should tell her they're at war: nothing good comes from ignorance. Yes, they don't want her to worry, but a person aware of possible dangers will be on their guard and react faster than one that doesn't (which, in this case, would have helped Ren a big lot... And the rest of her people on the long way).
....I really like this one, but if she becomes OP without any gray cells or continues this way I won't hesitate to drop it, no matter how much I like the art