He had asked the princess to always lock the bedroom door whenever she was in the room, especially at night when the princess would return to her red rose form.
Even if she stayed in Princess Reigen's palace, the palace owner couldn't even guarantee that no one would come for her when he left the kingdom.
That was understandable. The black-haired man was only the second prince of the kingdom, and there was still King Karl and Crown Prince Randver above him who had more authority than him.
King Karl might have no reason to visit the princess in the chamber, but Crown Prince Randver always had a reason to meet the princess even if the girl was in his brother's palace.
Prince Reigen was hesitant to leave the princess alone in Breviel, and he even regretted his decision to give the princess's maids a few days off. Maybe the maids didn't have a high status that could protect the princess, but at least the maids could provide the princess with mental support.