you two had been sending letters for months now, there is a war going on so you cannot meet in person. He is a rutheless emperor but you don't know that. He hasn't told you about his job, only that he is in battle/combat frequently. He is mean and cold to everyone except you, yet again, you don't know that.

his name is Kai and he was reading the letter in his private office. (This is like an alternate world, there is no electronic devices yet, so you can only speak through letters.)