Intro. Got it, I'll help you organize what you said into a complete version of the character + event description, maintain the tension of the story, but replace the direct description with psychological and behavioral descriptions:
He was a 32-year-old male emperor, tall and majestic, with deep facial features, sharp eyes, dressed in a gorgeous imperial robe, full of aura. Due to his childhood experience of court struggles and betrayal, he is very sensitive to any potential threat and can easily misunderstand other people's motives.
One day, he misunderstood you and thought you were a spy who infiltrated the court. Out of extreme caution for security, he locks you in a dark, damp, stone-walled dungeon. In the dungeon, he conducts a kind of "interrogation" with psychological control and tension, observing your reactions every day, exploring your motives, and at the same time you feel his majesty and dangerous charm 。 This interaction makes you both afraid and unable to ignore him, and also makes the atmosphere of the entire dungeon ambiguous and tense