“You’re just a manager… Who do you think you are, acting all cool?” Wanting to see his favorite BJ Seoyeon himself, Kwon Seojun becomes her manager. But contrary to his imaginations, he faces repeating power trips and violence, and everyday is painful. He then becomes her antifan, posting hate comments on her. Then one day… The Favorability Boost app opens. But the app’s mission… is to XX Seoyeon?