Responses
The reason is in chapter 81. The moment they discovered her being alive, they forcefully opened a gate to keep her and her group in check. They have far more shitty secrets to cover and they still want to stay as the top guild stupid as it is to say. They want to make her look bad by having Korea also in the limelight I think. Also a distraction as they might be going into hiding for the time being.
Why do they still care if the guild knows that she's alive when the world is going down the shitter and when she's that powerful? I feel like I'm missing/forgetting something