The Time Control Department wanted to prevent the worlds from getting destroyed. This went against the Elder's aim. Hence, it wanted to destroy the Time Control Department.
As for why it didn't do it at the start…
It was too weak then.
After it followed her into so many different worlds, it got confident… so it decided to kill its enemy?
Ming Shu suddenly hugged Qi Yu. "Baby, I'm afraid."
Qi Yu: "…"
Can you at least look scared?
But she called me baby!
Hahaha!
Qi He didn't know what Ming Shu was thinking. He just saw her hugging Qi Yu.
Weren't they talking about serious things?
Ming Shu released him indifferently after hugging him for a while. "So, when you realized that I appeared in those worlds, you used the Apocalypse to find my identity. Then, you sent this lunatic to come and find me?"
The lunatic: "…"
F**k, where is my knife!