Then I've done my job. ^^ Yoojung is upset about the new mission because she thinks (correctly) that the reason she was selected for it is that she's short. She'd be even more upset if she knew that the reason she was selected for her previous mission was that Madame Jisoo didn't know if she could trust her, so she sent her on a mission where her performance would be backstopped by another agent performing the same mission. ^^