Step 1: find an evil by any means necessary other than outing him. If it’s through an invest class then tell him the rest of the plan.
Step 2: Whisper him that you are evil king and that he should tell him the rest of the Unseen.
Step 3: if he does then out them all. If he doesn’t then if he was outed through invest/ you are good king then out just him. Otherwise pretend to be evil king to him for awhile until you need BD credit.
Note: This strategy is tested to work.